how many timbers in a 45 foot wide bay ?

[euroliner]

wondering how many timbers people use in the roof of a 45 foot shed ? seen some with as many as 14 and as few as 10

also seen some outa 8 x 5 steel and others in 10 x 5

 

[RWG Contracts]

wondering how many timbers people use in the roof of a 45 foot shed ? seen some with as many as 14 and as few as 10

also seen some outa 8 x 5 steel and others in 10 x 5

You want a maximum spacing of 4'6"

 

[Nose Abit]

wondering how many timbers people use in the roof of a 45 foot shed ? seen some with as many as 14 and as few as 10

also seen some outa 8 x 5 steel and others in 10 x 5

Depends what is going on the roof - if it's fibre cement, max spacing is 4'6" or 1375mm. If metal on the roof spacing can be up to 1800mm.

 

[euroliner]

Depends what is going on the roof - if it's fibre cement, max spacing is 4'6" or 1375mm. If metal on the roof spacing can be up to 1800mm.

be 0.7mm box cladding up on top

 

[Forever Fendt]

be 0.7mm box cladding up on top

are you sure thats a good choice what about condensation ? my 47 ft span buildings on 15ft bays are on 10" x 5.75" rafters and 12" x 6.25" posts

 

[euroliner]

are you sure thats a good choice what about condensation ? my 47 ft span buildings on 15ft bays are on 10" x 5.75" rafters and 12" x 6.25" posts

its only a livestock shed so condensation shouldnt really be a problem ?

there fairly beefy posts , that stuffs over 40kgs a meter compared to 25kg for 8x5

 

[RWG Contracts]

its only a livestock shed so condensation shouldnt really be a problem ?

there fairly beefy posts , that stuffs over 40kgs a meter compared to 25kg for 8x5

An 8x5 isn't strong enough for a 45' span shed

 

[RWG Contracts]

we use 10x5 on a 40' span now

 

[euroliner]

we use 10x5 on a 40' span now

heres the spec of one on ebay , now im tight as F%@K when it comes to money but even i thought this was a bit under speced

All buildings are CE marked

This is for the complete building all listed below

For the supply of a 60x40x12ft portal building
Agricultural spec

Steel works

10 Main collumns. 203x133
5. Portal frames. 178x102
3. Gable posts. 178x102
10. Lines of galvinised z purlins
2. Lines of timber eaves beams
1. Sets of roof/side bracing

 

[Forever Fendt]

An 8x5 isn't strong enough for a 45' span shed

oh yes it is (on a portal 15ft bays 15deg)

 

[RWG Contracts]

oh yes it is (on a portal 15ft bays 15deg)

would you use an 8x5 on a 45' span?

 

[euroliner]

oh yes it is (on a portal 15ft bays 15deg)[/Q

oh yes it is (on a portal 15ft bays 15deg)

25 kg or 30kg per meter ?

 

[Forever Fendt]

would you use an 8x5 on a 45' span?

not by choice but you can squeeze it through with 15 deg pitch 15ft bays and depending on location but all the buildings i have done at home are on 10'x5.75" rafters they look so much better and less than £4 per meter extra on the cost of the raw steel labour for fab should be no more but the galv would be a couple of quid extra per meter.I don't think anyone should even consider cutting steel sizes down to save money on the build after all its the main part of a building,and any longer than 4 bays we brace both ends in the roof

 

[Forever Fendt]

25 kg or 30kg per meter ?

25 kg 10% eaves haunch and squared at apex

 

[Philip Watkins]

its only a livestock shed so condensation shouldnt really be a problem ?

Don't you get more condensation in a livestock shed? Or do you mean it doesn't matter because it's only livestock?

 

[Bradrushtonbuildings]

10 x 5 3/4 or 10 x 4 would be more than suitable for that sort of size but i reckon 8 x 5 1/4 may be a little light all depends on final spec and location of building to be honest if it was fully clad potentially you may pass at that dependant on location but if square to eaves it certainly would not be big enough for the job.

In terms of purlin quantity on a tin roof i would would on 10 runs of purlins and 2 runs of eaves beams. 1800 maximum spacing is maximum spacing for most tin suppliers but i tend to work on a 1525 spacing for a tin roof

 

[euroliner]

Don't you get more condensation in a livestock shed? Or do you mean it doesn't matter because it's only livestock?

i mean its only livestock so any shelter is better than standing behind a hedge

 

[Forever Fendt]

would you use an 8x5 on a 45' span?

did you see the picture a few years ago with a chap repairing a gable end of a shed out of a bucket and someone had taken photo sent it to HSE it was in the farmers weekly ,that building was 45ft span and on all 203x133 posts and rafters erected at Alton Hampshire in 1989 its stood the test of time ,thats the second time the gable has been repaired ,we sheeted the gable with big 6 and the next day I drove through with sanderson forklift and took it out with the the top of the mast

 

[Philip Watkins]

i mean its only livestock so any shelter is better than standing behind a hedge

The point is, while the livestock may not mind too much about a few (or more) drips your purlins won't thank you for shortening their lifespan.

 

[Forever Fendt]

10 x 5 3/4 or 10 x 4 would be more than suitable for that sort of size but i reckon 8 x 5 1/4 may be a little light all depends on final spec and location of building to be honest if it was fully clad potentially you may pass at that dependant on location but if square to eaves it certainly would not be big enough for the job.

In terms of purlin quantity on a tin roof i would would on 10 runs of purlins and 2 runs of eaves beams. 1800 maximum spacing is maximum spacing for most tin suppliers but i tend to work on a 1525 spacing for a tin roof

it would concern me more if it was part clad maybe 3 sides with wind entering and know escape if it was fully open i would be less worried although the stability of the frame would be less