[Closed] inspired by shed threads, do you think its possible for.....

thanks chaps, very helpful, should be able to work out an exact price from that. is there any reason the onduline needs 3 'corrugations' overlap? if width was tight can you get away with 2 you reckon?

also any takers for Q's 1-3?

cheers

If the slab isn't usually under water you're fine to lay them on top.

Screws are preferable to nails generally. 4" will be fine,

It depends on the screws if you need to drill first. I always buy screws you don't need to drill (timber screws rather than wood screws). It more than doubles the amount of work having to pilot drill holes. You won't need to pilot drill for 4" nails (6" you probably would have to).

Ah didn't know there were different types of screw, wood and timber. Thanks a lot, much appreciated

struggling for help with my shed at the mo as my mate cant make the days i can. was hoping we'd have a good day at it friday but now looks like ill be on me own. i may have to do more of this myself than i thought!!

with that in mind, i may have to sort out the roof ring beam myself. floor ring sort of sorts itself out i hope, but not sure how high or what angle to do the roof. ive pretty much decided cost will dictate itll be a pent roof, either covered in OSB plus felt, or onduline with nothing underneath.
if i had to make a guess id say make the 4x2 ring 7ft at the front, and 6ft at the back. ive nothing to back up these sizes, ive plucked them out the air.

any comments on this please?

thanks

Where are you based?

Edit : Also...

either covered in OSB plus felt

I'd go for EPDM over felt every time.

im in lincoln mate. and ill look into EPDM, havent heard of that so far.

thanks 🙂

If you can get a gap between concrete and beam, airflow always helps. Just space it up temporarily with off cuts to get it level, then fix.

Think my shed at home uses 150mm self pilotting screws and I shoved coach bolts in because I had them.

Do put enough supports in for the onduline. Mine sags a little as I am about 6" over stretched due to being too lazy to grab another timber from the barn when nearly done. That said, it's fine. Height wise it probably goes from 7'-6'. Not a lot was measured, just used bits of timber as templates.

Finally, there is no consistency in timber measurements. We cut 4 different lengths of 6' for different buyers, and sell by weight, volume or hoppus and it will all be summarised as something else for easy invoicing.

If you can get a gap between concrete and beam, airflow always helps. Just space it up temporarily with off cuts to get it level, then fix.

Do put enough supports in for the onduline.

Finally, there is no consistency in timber measurements.

thanks

im in lincoln

Ah, okay. A few counties too far.

Good luck with the build. Enjoy it - carpentry is good for the 'soul'.

thanks for even considering helping, much appreciated, some great people on here. makes me think i may just get it built one way or another 🙂

bring on friday!

You've got uprights every metre and a bit to fix it to. Mine is about 4.5m span, just attached to corner posts. Admittedly it's a 6x2 and I had to jack it and put in a prop at the front (sloping site) after it sagged a bit under the weight of an old barn door and a couple of double glazing units, but you have far more posts to attach to and share the load.

The corrugations should be square to the supports, nail through the highpoint of the corrugation. 50cm sounds like the figure off the spec sheet I ignored.

i rested my flooring joists on bricks (spaced at 1 foot centres) to allow a little more airflow. Think they're 30p each or something. cheap and solid.

for screws i'm using decking screws for longer reaches, and external zinc plated screws for shorter (turbogold xts) - ie fixing the cladding. someone will probably be along to tell me they're wrong, but theyre cheap enough to use lots 🙂 impact driver meant I didn't need to pre-drill anything

out of interest, what are the clamps for? my sheds nearly done and I haven't used a single one yet..

out of interest, what are the clamps for? my sheds nearly done and I haven't used a single one yet..

with that in mind im gonna see how much 4 clamps are today in B&Q/screwfix etc.....

decided im gonna try 4" screws first rather than nails, just for the reason that i can unscrew them if i make a booboo.

also i was going to postcrete 2 end posts only, as theyre the ones nearest the fields/cliff that take the brunt of any winds. im now considering not doing so for the reasons above, 'moveabilty when wrong' 🙂
hopefully the weight of all that wood in the earth will be heavy enough to not move.

fair enough, i've just been fixing one end with a screw (not tightly) then wondering to the other end, levelling it, and whacking a screw in there. Once the first length of cladding was in, each one was just stacked on top of the old one, then lifted 2mm to get to the right height.

I also found cutting to length roughly (say 5mm over), fixing, then cutting them all to the correct length in one go with a circular saw was a good way to get a really neat finish..

good idea, however i dont have access to a circular saw. ill be using an electric mitre saw so the wood will need cutting to size beforehand.

as they say..... measure twice (then three times then four), cut once 🙂

as promised, more progress pics.....

had a good day today, my mate came over and helped a lot, certainly got me on my way and i can do a lot more myself now im sure...

all 8 posts are in now, end 2 are postcreted, and floor ring beam done, started on the roof.

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dunno how it happened but the post screwed into the concrete ended up waay out plus the bolts never really caught the metal plug to tighten, but....that seems to be the good thing about wood, theres always a work around so ive screwed a bit of 1" strut to it, it wont be seen anyway 🙂 its still as secure as the wood in earth i reckon.

the 4" screws given me were spot on, screwed into the wood like butter, so ill be using those wherever i can. i also bought some 6" quick-clamps from screwfix which are spot on too.

really feel on a roll now and want to get cracking again, but... bittersweet, im off on holiday before i can do any more now, so itll be a couple of weeks before any more pics.

thanks a lot for all your help, its invaluable.

on holiday at the mo but doesnt stop me thinking thinking thinking.....

i was thinking id be connecting all joists to the ring beams by screws into the ends of the joists. then i read about using joist hangers, and that screwing into the ends reduces strength by a third etc...

opinions from the experts please? 🙂

Id just nail them, a couple of nails through from the outside of the ring beam into the end of the joist then some cheek nailed through the joist back into the bean on each side.

Use a block of wood clamped beneath the ring beam to support the joist at each end. Make a spacer so the centres of your joists are at 600mm centres or what ever the flooring material is.

I'd still nail a length of 4x2 vertically between your floor and roof rails, midway between your 4x4 posts, to give more support for your cladding.

back from hols, nice weather today, so had a full day at it.....

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got all the floor joists in and the noggins. took ages breaking up different thickness slabs we got lying around in the garden, to use as supports. theres all sorts of stuff under there, bricks, slabs, and where i couldnt find anything the right thickness i made little tapered chocks. not convinced theyll stay under nice and tight as the wood moves about, but ive got that many other bits of concrete and bricks that its pretty solid.
no comments please on state of garden, washing on line, or mrs expunk sat on her a*se while im grafting 😉 its a building site at present, itll all be tidied on completion 😉

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also had time to sneak a few decking boards on, but ill have to wait for my mates tools to do the nearest couple as theyll need jigsawing around the posts.

I'd still nail a length of 4x2 vertically between your floor and roof rails, midway between your 4x4 posts, to give more support for your cladding.

tomorrow im hoping to get cracking with the shed side of it, thats a lower floor and a couple more posts to put in.

still not decided on roof yet so wont put roof joists in until i know where theyll need to be positioned.

thanks

It's looking more like a shed with every post. Keep at it, winter is coming.

another hard day at it with my mate. half the decking now done (discovered 9 damaged boards so waiting now for them to deliver some swapsies) and the shed structure nearly complete. door and window frames put in, tops of posts sawn off and the shed floor joists in.

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have to start thinking bout roof now as ill need to be putting some roof joists in and need to know widths for connections.
none of the top can be seen, so all im bothered about is it being waterproof and 'not looking sh1t' from the inside.
with that in mind my mate has suggested 5mm ply as base layer, followed by thinnish OSB, then felt on top.

anyone care to comment on that at all?

thanks

Just use a 12 or 15mm external ply unless cost is a issue just use Osborne and finish the boards on the middle of rafter.
Rafters minimum 400mm oc.

If you can get away with it put some diagonal braces in..

Just use a 12 or 15mm external ply unless cost is a issue just use Osborne and finish the boards on the middle of rafter.

Rafters minimum 400mm oc.

If you can get away with it put some diagonal braces in..

just been thinking bout that in the bath (its where all the best thinking happens...) and ive started wondering about the weight of the roof. the more rafters i put in, plus diagonal braces maybe, all adds a big heft to the weight of the roof. ive started thinking that all that weight is supported in the main by 4" screws.
all that weight is on the roof ring, which is screwed to side of the posts. ok, shed side ive got a few more beams built into the structure, but gazebo side theres nothing.

should i be worried?

Osbourn = osb auto correct sorry.
I'll have a quick study of your build..
Re rafters..what's the span?

the whole structure is roughly 7m X 3m. (split is roughly 5m gazebo, 2m shed)

4" screws have a high shear strength..what size screws are they 100mm x 5 or 6mm. If no moisture gets in to them they won't rust. As for the braces I'd be more concerned about the side load caused by wind over the months years etc..
Treated 100 x 50mm C24 at 400mm centers will be good for any snow-load that might occur in this country. 15mm ply will aid roof strength better than osb.

Will the roof be over the decked section ?
I'd personally use 150 x 50 C24 @ 400 oc but as you've already the 100mm on the ring I'd reduce the measurements 100 x 50mm treated C24 305mm oc and use ply lengthways front to back and stagger the joints..ie. 2.44m + 0.56m ( 3m ) then on the next row.start with 0.56m + 2.44m...

just been out to garage to look. theyre reisser cutter screws, yellow tropicalized, 100 X 5mm.

good enough to take that weight do you think? would i add twice the roof strength if i stick 4 screws in per post instead of 2?

ill look into 15mm ply costs. thanks.

EDIT: looks like we were typing at the same time..... dont really understand all that, have you got a link to the boards youre suggesting? and yes, the roof will cover everything, its the full oblong.

EDIT EDIT: ah i understand a bit more now, youre on about preferring 6X2 but accept id be using 4X2 yep? and all the wood ive got is tanalised, not sure how that compares to C24.

and your 305 oc? youre suggesting 4 joists per board??

what thickness and quality ply would you suggest?

thanks a lot

Looks like you are doing a good job, keep the pics coming as you go along!

The boards I'm suggesting is ply. A full ply sheet measures 2.44 x 1.22m. The roof slopes front to back and is 3m long. This would mean if you put a ply sheet on lengthways front to back you'ld be left with a 56cm cut. The piece of board you have left you cut off a 56cm rip and start the next row with this. You'll get 4 56cm wide strips out of a full sheets of ply.
Over a 3m span I'd normally use 6x2s @ 407mm centers but you've already 4x2s forming the ring so I'd span the 3m with 4x2s but bring the centers down to 305mm.
Put noggins in to prevent twisting.

Edit..we're typing at the same time again..over the 3m span I'd definitely go 305 centers..on the shed bit you have a supporting wall so 407 centers will be fine.
Don't go to travis for your ply. I'm trade and buy my ply from wickes at normal prices as it's cheaper than TP.
Wbp ply if you can get it if not Hardwood ply from wickes..

thanks mate. just looked at wickes and cant see any 15mm hardwood ply there at 2.44 X 1.22.

google shows Travis Perkins do sell them. ive had all my wood from there so far and have been haggling on price and knocking price down so have a decent relationship with them.

how much would you be happy to pay for 15mm sheets if i give em a ring and say i wont pay any more?

i finished my roof last week, used EDPM instead of felt - cost more, but was pretty easy to lay, and given the amount I'd spent on the rest of the shed, I figured a longer lasting, more waterproof solution was best

[url= http://www.wickes.co.uk/Structural-Softwood-Plywood-CE2%2B-18x1220x2440mm/p/120945 ]wickes 18mm ply[/url]

Last time I asked TP for this they wanted £50

i saw that mate but noticed its softwood. TP is hardwood. is softwood still ok?

It says it's rated for external use so yes..

What about OSB3? Cheaper than ply.

wickes 18mm ply

Last time I asked TP for this they wanted £50

do you know from that description whether that is indeed WBP and if its any better or worse than the wickes stuff?

What about OSB3? Cheaper than ply.

thanks

EDIT: just done a proper measure, with a bit of overhang at the back, its 6.7m X 3.4m.

change of plan for the roof. ive already got two 18mm OSB boards for the shed floor, 8ft X 4t and it takes 2 of us to lift one, theyre heavy!

i really was getting quite worried about a dozen+ big 4be2 joists plus 9 of them boards, thats some weight!
i started questioning why i need that weight (i dont think i do), i only want a cover, and the lighter the better.
i started looking at onduline again, got a quote from a place online, realised wickes were cheaper, realised my mate has a 20% discount at wickes and on impulse rushed through a purchase before he goes abroad tonight for a couple of weeks.

so, im having 16 green sheets delivered tomorrow. should have ordered the screws too but didnt want to p1ss my mate about with too many things when he should be packing 🙂

did it all quickly, hope my sums are right. each sheet is 950 by 2m (950 becomes 850 after overlaps). i figure 2 of them per 850 width will give me the depth i need with plenty to spare. and 8 of those comes out at 6.8m, i need 6.7m. think im ok. now have to work out how to fit these things, may need less actual joists and more thinner wood going across, not sure yet......

EDIT: oh, and at £179 for 16 sheets im happy with that.

Wouldn't of been my choice of material for a pent roof but hey ho.

yeah dont know if ive made a booboo or not, as i say it was a snap decision driven by my fear of overloading the roof ring with too much weight.

the dynamics of fitting it tho and all the accessories may make it dearer in the end :-/

ok, this really is 'make it up as you go along'..... 😀

ive cancelled the onduline. looked at how you fit it (on purlins which are mounted on top of joists) and realised ill struggle to stop the wind getting underneath it, [i]and[/i] to dress it well enough afterwards without more wood on the ring beam. im stumped now.

ive mentioned i want the roof to be as light as possible as i dont particularly trust the weight of a dozen 4be2 joists plus 9 sheets of 18mm ply on just screws. i was awake half the night thinking bout this, its not doing me any favours 😀 i considered last night that its probably an even worse idea than i thought before. rather than the whole ring taking that weight, really all the weight of that wood is just on the front and rear beams, as each beam is individually screwed to the posts, theyre not connected to each other.

my gut feeling now is to go back to the ply option but as thin as poss, 5mm or somethings. im pretty sure youll advise its a bad idea but why? if its supported well enough i cant see half metre sections sagging for instance.

could i have your thoughts on that please?

thanks a lot, we'll get there in the end, all part of the journey 🙂

Firstly if the strength of the screws is bothering you whack a coach bolt or a bit of studding through the joint. Easy to retro fit and will significantly strengthen the joint.

Thin ply isn't a great idea. It'll take its own weight to start with but over time will sag. I'd say 15mm minimum but 18mm is often cheaper as its more readily available.

Once you've got a solid deck any number of waterproof top layers will do. Felt roll (or shingles if you have a pitch), epdm or fibreglass for a tougher but more expensive finish.

I wouldn't worry about the weight of the ply. A foot of snow however...

Firstly if the strength of the screws is bothering you whack a coach bolt or a bit of studding through the joint. Easy to retro fit and will significantly strengthen the joint.

been googling again..... what about [url= http://www.wickes.co.uk/Wickes-10mm-Twinwall-Polycarbonate-Sheet-900-x-3000mm/p/105909 ]polycarbonate sheets[/url]? they say theyre for shed/garage roofs etc, would they take a foot of snow/not look sh1t? think they do opaque as well.

i picture it looking a bit like this from inside the gazebo which seems acceptable. even better if opaque.

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