[Closed] Floor joist systems

There are lots of systems which have a metal 'web' with timber top and bottom chords. Try googling easijoist or ecojoist, or more generally metal web joists. They will normally span 5-7m.

could have a look at Finnforest?

The biggest problem you will have is getting the timber that length.

Try Glulam beams, expensive but nice.

Try here :-

[url= http://www.dunscartimber.co.uk/ ][/url]

Alternatively, put a piece of steel in to break up the span.

LVL web should manage it (subject to engineer calcs)

cheers chris/mrmo - found easijoist etc now and trussform and finnjoist.

I wish they'd put some pricing on their products and make span tables more easier to find!
Im going to have to send off for a quote I think 🙁

lowey trying to avoid steel at the moment as I really want to try and get joist runs in a particular direction (service routing and long uninterrupted space) as well as avoiding reg calcs, padstones and all the other bollox required for a steel 🙂

how much would glulam cost at that span and for normal domestic loads?

aP - LVL? cant find anything on google...

I really want to try and get joist runs in a particular direction (service routing and long uninterrupted space)

Ease of service routing is less of an issue anyway with web joists - they're normally open enough that you can take most services straight through them.

Try Glulam beams, expensive but nice.

floor porn?

m - yes, I know, but if I spend the money on web joist I might as well get them long enough to span 🙂

If I put in intermediary steels and use bog standard shorter sold timber joists then Ill have more notching/holes incl soil to do.

LVL - laminated veneer lumber - finnforest are one such supplier, kinda like glulam but cheaper.
kerto is their TM.

cheers aP

Why are construction firm websites such a waste of space.

Little in the way of technical material. No pricing.
No supply details.
arrrggghh.

Its like you need to be in the Worshipful Company of Lumbermen with a funny handshake to get the information you need for designing/costing self builds.

And which ****t at Plannign department though it would be a great idea to take the span tables out of the regs so that you had to PAY TRADA or whoever they are for data that used to be free and in the public domain!

grerrrrrr!

bear with my ignorance of building specs, but,

do you just want bigger lumps of wood?
find a smaller mill that can deal with requests
we felled a load of stuff in 7m lenghts for one fella

stoner - just phone them up, ask to speak to their tech department, and ask them what product is appropriate, for them to do the calcs and then to provide a price.

timber - would that it were so simple 🙂

apparently just whacking in bigger dead trees isnt enough 🙂

the regs stipulate certain characteristic limits for floor joists assuming given load expectations, size of joist, distance between them and then for a given quality of wood it tells you maximum span.

Unfortunately bog standard 8x2 or 8x4 or 9x4 is all too weedy for my spans apparently 🙁

will do aP. Ta.

Why are construction firm websites such a waste of space.

Because we make the prices up as we go along, give discounts to anyone who asks, and prices can be very volatile and finally we have to give our reps something to do other than sit on the beach all day.

Stoner - ygm (to your profile email address)

cheers -m-

I might [i]just[/i] get away with 8"x3" of C16 or 8"x2.5" of C24 - that's a hefty bit of wood though 😮

oh well was just wondering, we had a 10m beam milled at 360x360 for a clearspan bridge and our miller does big oak beams for barn conversions and historic renovations - he's more clued up on building spec' than I

otherwise as aP suggested - make them do the work for their money

Hi.
Dropped you an email with some info I found useful.
PT

Try and get a copy of the "FF1814 Finnframe floor system" booklet from Finnforest - includes span tables and construction details. Your span / centres is certainly possible with their Finnjoist system, but the joists will be at least 300 deep.

Stoner - have you tried Ultrajoist - all timber solid wood.
Not sure if it will fit the bill but worth a look - made by Glenalmond Timber in Methven, near Perth.

Saw this on Building talk:

[url= http://www.buildingtalk.com/news/gln/gln101.html ]"Ultrajoist outspans I beams"[/url]

the Gulam I-beams mentioned earlier are good. the section between the top and bottom beams is usually stirling or ply boards. we had one at around 8m once.

very light weight for the length. they do not twist like traditional timber joists and as such need less bracing.

If its not exposed forget Glulam, too expensive.

Cant you introduced a mid member so the joists span halfway?

a C24 - 89x235 can span 6.09m (With loads of I - 1.5kN/m2^ D - >0.25)

if youre struggling try Trujoists or similar

cheers for all the pointers guys.

Rough and ready measurement off plan says something like 5.30m so we might just get away with the specs I mention above.

and even better news, we've had the offer on the barn accepted to you can all call me Stoner the Builder from now on 🙂

Ill be back on site later this week and do some proper measurements (plans are A3 vendor's architect copies)...

Martin - dont want a mid member as this is a barn - 20m+ long by 5.3m ish wide.

Want to try and preserve the open space. Outer walls and tie bars/tie beams only.

Go for a 89x235mm in that case 🙂 C16 that is

Go for a 89x235mm in that case 🙂 C16 that is

roger, cheers for that but...typical construction Co website ultrajoist goes straight to holding page and no other hits on google so cant download their span tables.

Do these people not need the business or something! 🙄

Martin - any idea how much one of them costs? or a 75 x 235?

Seriously Stoner, get yourself a structural engineer, for the £200 you'd have to pay you'll more than save that in time, hassle and building-the-wrong-thing-and-having-to-take-it-down-again.

Austen, its floor joists. not rocket science.
all Ive got to do is find a joist that meets regs on span and loads and install it to regs and manufacturers requirements.

Over the years of bashing bits of building around slowly building up my experience (and working with my builder mate) - learning to copper plumb, screed, build stud, install steel beams, padstones, new window openings, lintels, using acroprops etc etc - the more you realise that a lot of the time you just dont need to throw money at "specialists" and much of the mystification is just to create the impression of complexity. Bit like lawyers really 🙂

And Im perfectly aware of how this might make me look, but then you probably dont know what experience I do have or at what point I [i]do[/i] pay for advice. My original question was for recommendations for joist systems/products. I already know what I need, just not what will do it.

Structural Engineers just get paid to do kindergarten sums 🙂
(as it happens when it comes to load bearing steels I would use an SE)

Would have contributed earlier Stoner but only just seen this one.

Make sure you have a good drill when it comes to it.

i missed your input DD 🙂

for a job like this I might even splash out!

Stoner as a Structural Engineer with 15 years post grad experiance send me your email addy by PM and we can do kindergarten sums together 😉

GT

GT you dont have a PM address. I do though so drop me a line 🙂
I'll bring the fisher price.
🙂

EDIT: PS Takisawa - I never got a mail from you, so if you sent one, Im not being rude and ignoring it! 🙂