Condensation and dehumidifiers

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  • Condensation and dehumidifiers
  • Premier Icon sadexpunk
    Subscriber

    Is this floor cold to the touch, if hazard a guess it’s very cold, it’s the same cold bridging effect. In modern construction we now insulate under solid floors and also around the perimeter where it abutts the external walls. All stuff that wasn’t regs when your bungalow was constructed.
    On another note is the whole house tiled then carpeted?

    yep, its a cold floor, concrete, tiles and carpets.

    Do your Windows condensate loads, or a little, or not at all?

    i never really notice but my wife says its quite a lot. not just the bedrooms in the morning but the lounge too she says.
    dont have anything to measure humidity but im interested in what it is so ill look into that. anything cheapish that youd recommend?

    This one’ll shift 170m^3/he but looks quite big.

    yeah does look big, altho if it removes more moisture…….

    In the kitchen, you really need an extractor right near the cooker, rather than on an external wall (although that will be better than nothing.

    im going to go up in the loft tonight and see if i can suss out how difficult itd be to change the cooker extractor from one of those dead-end filter jobbies to vented to outside. i assume id need to go up in the roof with an elbow to horizontal outside? does condensation not drip back down the vertical bit?

    thanks

    wrightyson
    Member

    Yes it can drip down again through the same effects, loft being cold and warm air passing tbrough. We now have to use insulated duct in any loft space extractions.

    MrSmith
    Member

    Yes it can drip down again through the same effects, loft being cold and warm air passing tbrough. We now have to use insulated duct in any loft space extractions.

    Is that your area of expertise? I want to fit an powerful inline fan in my loft to pulll air from both kitchen and bathroom in my flat, there are ceiling vents in hallway and living room which are linked to what looks like grey plastic waste pipe in the loft and up out through the roof, Is there a ducting/valuing product that will allow me to tap into this pipe but not blow air back down into the living room vents? Like a flap that moves under fan pressure? I don’t think my lease allowed me to drill a hole in the wall so this looks like the best option.
    (Sorry for the hijack but at least it’s on topic)

    wrightyson
    Member

    My area of expertise? I build things, housing projects to mega sheds and deal with regs daily. Jack of all 😉

    neilnevill
    Member

    if you want a measure of humidity Just have a look on ebay or amazon for clock and weather stations, they are only a few pounds. they won’t be super accurate perhaps, but it doesn’t matter if it reads 70% when its 75% as its in the ball park and its the change you are probably more interested in, being able to see if one or 2 rooms are really humid (a source?) and see if your fans or other work helps loads or just a little.

    5plusn8
    Member

    wrightyson, are you around the south east? We are always looking for contractors. Email in profile.

    Premier Icon cynic-al
    Subscriber

    10,400kwh pa is low in my experience.

    wrightyson
    Member

    wrightyson, are you around the south east? We are always looking for contractors. Email in profile.

    I’m based in Derbyshire, but will eventually have to spread my wings. I’ve been very lucky and not travelled any more than 15 miles in 20 years for work which is unheard of in construction.
    Likewise if you ever head further north and need assistance I have countless quality subbies from steel fabrication to sparks to plasterers to brickies that we use regularly.
    Google denby hall business park, that’s what I manage, mostly….

    Premier Icon sadexpunk
    Subscriber

    10,400kwh pa is low in my experience.

    you saying i dont have my heating on enough? are you my wife?
    (well they certainly charge enough for it *grumble grumble grumpy old man content). 😀

    been thinking about it overnight, changing the bathroom one from flexi up in the loft and back down the soffit, to slightly sloping straight out the wall……

    if the soffit IS at fan level, preventing a straight run out, would i be better off making the hole lower and still using the flexi duct downwards instead of upwards?
    was thinking of still trying to use solid pipe at an angle but not sure id be able to fix it all together in the tight space with an elbow say…..

    Premier Icon sadexpunk
    Subscriber

    *too late for the edit……..

    so this hygrometer say…….
    hygrometer

    it has a low and high humidity figure (52% to 69%) with a ‘big reading’ of 52.
    what would that tell me? is it a range over 24 hrs or summats and 52 is what it is now?
    been looking at a few and theres a lot of complicated equipment with lots of readings, weather stations etc. i just want something that i can stick in a room and it says x% dont i? and move it to another room and itd take a minute or so to change reading to new room?

    thanks

    B.A.Nana
    Member

    Re Hygrometer, I decided it was probs best to buy one that can be calibrated and buy a Boveda one step calibration kit at the same time. I think they say several hrs in a room for a proper reading, but IME you will see a change on the display quite quickly for an indication of roughly where things are at.
    High and low are highest and lowest readings since your last reset /turned offon / took batteries out. main reading is current

    spekkie
    Member

    We started to have a damp problem in our apartment. Buildings here cater for being cool in summer not warm in winter (we’re in the Spanish Pyrenees).

    Wet windows and window-ledges every morning and mound forming on some walls.

    We have a couple of portable gas heaters which are apparently the worst culprits for this problem. We’ve found the only answer is to leave all the windows open a crack, even when it’s cold outside.

    Took a day to dry everything out but now it’s actually less cold inside than it was when it was closed up but damp

    Premier Icon cynic-al
    Subscriber

    t has a low and high humidity figure (52% to 69%) with a ‘big reading’ of 52.
    what would that tell me? is it a range over 24 hrs or summats and 52 is what it is now?

    You whould be able to find a manual that tells you by googling the model.

    Premier Icon sadexpunk
    Subscriber

    High and low are highest and lowest readings since your last reset /turned offon / took batteries out. main reading is current

    rightyo, thanks. ill go for summats simple like that then. if i get any weird readings i believe i can check its effectiveness with the ‘salt test’, but it should be good enough to give readings of interest. only a tenner too.

    cheers

    B.A.Nana
    Member

    High and low are highest and lowest readings since your last reset /turned offon / took batteries out. main reading is current

    rightyo, thanks.

    Er, just occurred to me, that’s what mine does, what you’re looking at buying might differ. as cynical says, the instruction manual for make/model you’re considering will almost certainly be online

    5plusn8
    Member

    Likewise if you ever head further north and need assistance I have countless quality subbies

    Cheers.

    myti
    Member

    I have a very simple weather station like that and an extra probe. Right now it’s 19 degrees and 53 humidity in my living room and the probe is reading 4.8 and 80% humidity in my fridge.
    Bit off topic but was interested to see that thus morning all my windows were frosted up on the outside so I couldn’t really see out apart from near the frames but none of my neighbours windows were like this. Is that due to my triple glazing?

    Premier Icon sadexpunk
    Subscriber

    if the soffit IS at fan level, preventing a straight run out, would i be better off making the hole lower and still using the flexi duct downwards instead of upwards?
    was thinking of still trying to use solid pipe at an angle but not sure id be able to fix it all together in the tight space with an elbow say…..

    anyone care to give advice on this please?

    also, been googling making the 100mm hole. should i hire a diamond cutter (100mm?) and use it with an SDS drill? or a smaller sds bit and make lots of holes then chisel it out?

    drilling everything from the inside, or inside and out meeting in the middle?

    lastly (for now) will any flappy cover do for the outside, or will some not be able to cope with the amount of air moved? does the cover need to match the fan?

    thanks

    wrightyson
    Member

    If it was me I would buy a decent extract fan and mount it so it was below the soffit. I would give it 10mm of fall to the outside using rigid pipe. The od of standard waste is 110mm so a 112mm diamond core is ideal. Get your measurements right and pilot a hole from inside. This pilot hole will then form a hole for the “centre guide” on the diamond core to get you started. Get up nice and high and hire a specific core drill and bit, far less painful when it grabs. Measure the depth of the core, once you are at this depth you will need to remove the inner leaf core if it hasn’t already come loose to enable you to drill the outer leaf. Cut 110 pipe to length, fit fan and fit grill.

    Premier Icon sadexpunk
    Subscriber

    so leave the original crap one in place and drill a totally different hole then? so two fans on the wall, one in effect a dummy?

    thanks

    Premier Icon sadexpunk
    Subscriber

    and is this one ok do you think? cant find that original fan in the ‘max’ version anywhere so just did a google search for centrifugal fans. the bumph is 25 cubic ft/min, how does that compare to the 123m3 of the blauberg?
    manrose fan

    5plusn8
    Member

    I agree with wrightyson. Drill lower, I would be tempted to pipe out of the wall beyond the soffit. Otherwise your hot damp air might go up into the roof.
    This is the fan I have coming for work to test. Mega output, works over long runs. https://www.fastlec.co.uk/ventilation-extractor-fans-vortice-extractor-fans-vortice-quadro-centrifugal-fans/

    stumpy01
    Member

    the bumph is 25 cubic ft/min, how does that compare to the 123m3 of the blauberg?

    Well, the link you provided said 90m^3/hr in the description. So the other one provides ~1/3x more flow.
    But flow isn’t the be all and end all; you also need to see how much pressure the fan can generate and quite often as flow goes up, pressure generated goes down.
    If your bathroom is 3*2*2m then that is 12m^3. So a 90m^3/hr fan will give you 7.5 air changes/hr or it takes 8 mins to change all the air in the room, theoretically of course!
    Also check that the bathroom door isn’t too tight. If there is nowhere for the fan to suck fresh air from, then you’ll have very little flow.

    Premier Icon sadexpunk
    Subscriber

    If your bathroom is 3*2*2m then that is 12m^3. So a 90m^3/hr fan will give you 7.5 air changes/hr or it takes 8 mins to change all the air in the room, theoretically of course!

    yep, i get you. but…..theoretically the fan i have now will officially move Xm3/hr, but it doesnt, it barely touches the air around it. i want something that really does shift that amount of air, something that sucks you into the bathroom as you walk past! 😀

    Drill lower, I would be tempted to pipe out of the wall beyond the soffit. Otherwise your hot damp air might go up into the roof.

    wouldnt that just result in a very unsightly 4″ plastic pipe sticking 2ft or so out of my wall? i havent seen any other house with anything like that, are soffits likely to leak the moisture back into the roof?

    thanks for the fan info, looks like my link wouldnt be sucking me into the bathroom any time soon then. have you got a link to anything suitable? the recommended fans so far dont seem to be for sale anywhere…..

    thanks

    Premier Icon sadexpunk
    Subscriber

    ah yes it is, bit more expensive than id like to have paid, but as i always say, foolish to ask for advice and then not take it. unless theres a cheaper one thatd do a similar job? seems quite a large jump from the £35 of the blauberg….

    right……ive been up in the loft looking to see whether i can finally put my mind to rest with the present bathroom extractor, and yep, theres no mileage in widening the current position, ill take the advice and fit a new one lower down and t’other side of the room.

    im looking at doing the same in the kitchen, altho i found by accident that theres already something there, but i can see it being less use than the bathroom really.
    kitchen

    there seems to be a small oblong hole going to the outside, got a plastic cover on the exterior wall, smaller than the bathroom tho and high up shielded by the cupboards.
    would you agree thats next to useless?
    any mileage in trying to cobble up something from that hood extractor to make it a bit better than charcoal filters? itd mean drilling a hole in the stainless steel tho and im not sure if thered be much benefit to it, what do you think?

    and sorry, but we’ve just located ANOTHER damp issue……..
    i mentioned we’re doing up our bedroom, until then we’ve moved our bed into our extension. looked today and theres damp plaster above the window.
    im hoping this will be condensation too, but above a window? doesnt sound right.
    extension

    i cant guarantee it hasnt been there all along, we’ve only just noticed it since moving into the room. its a west facing wall, newish extension (5 years or so) and a flat roof. no pipes or anything and no access to it. ive been up the ladder and cant see anything suspicious and it hasnt been raining lately, just the odd bit of snow.
    outside extension

    wotcha reckon to all this, its a game innit :-/

    wrightyson
    Member

    That hole would have possiblybbeen for a previous extractor, you can rigid duct that shape which is ideal for in stud work or for on top of units as it wouldn’t be visible.
    As for the window I’d very much doubt that would be condensation, the thermal break in the frame would tend to prevent that from happening. Window looks very close to the reveal and it could easily be water tracking across the lintel from a poor silicone seal at the head.

    5plusn8
    Member

    You can cut a hole in the stainless with either tin snips or a drill powered nibbler.
    This clarkes one works well for one off jobs.

    https://www.machinemart.co.uk/p/clarke-dhc-2-double-headed-metal-nibbler/

    I would defo sort the kitchen. We use either 110 soil or 100m white extraction round pipes. if you are drilling in the bathroom, drill out where that oblong is.

    As regards the new damp – listen to wrightyson.
    we have stripped and re siliconed around a few DG windows with lintels above like that, I think it is due to this. I’ll ask the contractors on monday.

    5plusn8
    Member

    To understand the lintel issue – look at this. https://keystonelintels.com/products/steel-lintels/
    see how the lintel is directly above the UPVC. If the seal between the window and the lintel is crap than the water can track across and make the inside plaster damp.

    Premier Icon sadexpunk
    Subscriber

    Window looks very close to the reveal and it could easily be water tracking across the lintel from a poor silicone seal at the head.

    got to admit i dont know what that means….. dont windows just plop into the hole thats there, so what are you saying is different to other windows?
    and where is ‘the head’? how can i check water ingress? is it going to be stripping the plaster back? :-/

    if you are drilling in the bathroom, drill out where that oblong is.

    that oblong is in the kitchen. if i was to use that id be drilling into the stainless extractor and attaching some sort of duct. im thinking that wouldnt be enough tho, id still need a superduper extractor on the wall too wouldnt i?

    thanks

    EDIT as typing at same time as you….

    see how the lintel is directly above the UPVC. If the seal between the window and the lintel is crap than the water can track across and make the inside plaster damp.

    must admit im still a little lost, but i accept this explanation 🙂
    question is tho, what water? wheres it coming from? we havent had any rain for a while….

    5plusn8
    Member

    If a flat level plate gets wet, the water will “wet” out, I spread out, if it is on top of the plate, or underneath it.
    Possible the lintel might be slightly tipped back so the bottom plate goes down hill into the house.
    Just clean off and re silicon.

    5plusn8
    Member

    The extract fan will probably be enough, if it doesn’t work you can put in inline 100m fan along the length of tube. They are very good.
    https://www.i-sells.co.uk/domus-vitalis-high-performance-mixed-flow-in-line-shower-100mm-fan-white?

    Premier Icon sadexpunk
    Subscriber

    Just clean off and re silicon.

    you do mean after stripping plaster tho yep? no way around that? ive asked the original builder to pop round tomorrow, ill let you know what he says.

    The extract fan will probably be enough, if it doesn’t work you can put in inline 100m fan along the length of tube. They are very good.

    we’re talking about that little oblong kitchen hole now arent we? so you think the howdens extractor fan would be good enough to remove the cooking condensation, and maybe boosted by one of those fans yep?
    and if so, i assume theres no point going 100mm ducting up there as thatd be bigger than the hole, which is its weak point yep?

    thanks

    EDIT: just been looking again and i think you have to use 100mm ducting, so maybe reducing down with an adaptor at the end to fit the oblong hole?

    wrightyson
    Member

    Back to basics then young man 😂.
    Basically your window frame isn’t very far in reveal, as in set back from the face of the brickwork. This can sometimes leave them a little exposed. The silicone we are referring to is the silicone around the outside of the window which creates the seal between window and brickwork, after time it can shrink a bit and leave small cracks for water to penetrate. It was just a thought, it may not be that, have a good look at the sealing around the head of the window (the top). HTH

    5plusn8
    Member

    1) Kitchen extraction and oblong hole.
    I would brick up the oblong hole inside and out.
    Dismantle the stainless chimney to see what heights everything is – you will need a 90 bend outlet from the top of the fan.
    Then drill a round hole at the right height in the area where the oblong hole is to take 100 or 110m round pipe.
    Use the nibbler to cut into the stainless chimney.
    The fan in the hood will be a centrifugal one, it will be pretty pokey. If after you have installed an exit pipe you feel there is not enough punch, then fit the in line one, you could remove the fan from the hood and run the inline one on its own. There will be a controls issue you will have to solve, so probs the light on the hood will work, and have a separate switch for the inline fan.
    it is possible a decent electrician can wire them up together, but some of the fans are 12v,
    I doubt it will be necessary to fit the inline fan too though.

    2) Bathroom extraction – that fan I recommended is uber powerful…

    3) Damp above window. as wrightson says I mean take the silicon off the outside. And reseal around the window and where the window meets the lintel.

    Premier Icon sadexpunk
    Subscriber

    Back to basics then young man

    thank you, every days a learning day 😀

    Basically your window frame isn’t very far in reveal, as in set back from the face of the brickwork. This can sometimes leave them a little exposed.

    ahhhh i see what you mean.

    window

    just been out for another look, then looked at rest of the hose and neighbours, and theyre all the same, so must be fairly normal? builder probs just wanted to make it all match. i get the exposure thing tho, its very bleak on that side of the house, overlooking fields and on top of a hill, altho….. like i said, it hasnt rained.

    The silicone we are referring to is the silicone around the outside of the window which creates the seal between window and brickwork, after time it can shrink a bit and leave small cracks for water to penetrate. It was just a thought, it may not be that, have a good look at the sealing around the head of the window (the top). HTH

    gotcha! again, been out to look at what you mean and er…… there isnt any silicone! i can see the steel lintel, and mortar but no silicone. and maybe more telling, i can see a gap where the windows settled?
    window

    window

    I would brick up the oblong hole inside and out.

    Then drill a round hole at the right height in the area where the oblong hole is to take 100 or 110m round pipe.

    brick up to drill again? i assume this is so there can be a pilot hole for the big hole saw yep?

    2) Bathroom extraction – that fan I recommended is uber powerful…

    which is what i asked for, so ill order it. (you do mean the vortice quandro dont you)

    thank you both.

    5plusn8
    Member

    brick up to drill again? i assume this is so there can be a pilot hole for the big hole saw yep?

    Yes. The flow area of those oblongs are a bit crap, we prefer a decent round tube…

    which is what i asked for, so ill order it. (you do mean the vortice quandro dont you)

    Yes Vortice Quadro Super THCS Surface Centrifugal Fan
    https://www.fastlec.co.uk/11989-vortice-quadro-super-hcs-surface-centrifugal-fan.html
    It has humidistat, timer, two speeds, its bigger than the 100mm hole. check the dims here. http://www.fastlec-pdf.com/product_pdfs/VortQuadroRange.pdf

    thank you both.

    You are on a forum where everyone loves to be right and admire the sound of their own voices, thank you for providing us with the opportunity to drone on and on..

    wrightyson
    Member

    That’s you guilty party! Fill that gap with clear slicone, nice thin nozzle and gun it in, if you look at your pic there is white silicone between the u/s of the lintel and frame and that looks ok.

    wrightyson
    Member

    As we’re working as a team, 5plus and I will split the 500+vat, you know fairs fair and all. 😁
    Hope you get sorted, good luck.

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