Printable View
Hi all
I am wanting to replace a beam in the roof that covers my existing deck, i want to put in a beam that has a biggest possible span as i really dont want many supports. Preferably 1 post at each end. I just dont know what size beam to use.
The length of the roof is 4400mm,
width to the beam 2000mm
Total width of roof 2300mm
All the frame is 100 x 50mm Hardwood
Want to span 4400mm. Can anyone suggest a beam size and span length.
Regards
Scott
Photo would be great, framing manuals talk about Roof load width and rafter span and spacing etc..
Sometimes a photo is the best way to know we are all talking about the same things
Cheers
Pulse
Here are some pics of the roof
G'day.
I just ran your dimensions through the "Timber Solutions" Span software.
It shows a 125x38 unseasoned hardwood beam will do the job.This is to support a roof and ceiling. A post at each end with 1 in the centre.
Beam span to be 2200mm between posts.
Hope this helps.
Would i be able to use an LVL or I beam. how would they go semi exposed to the weather, or would the hardwood be best
No. The span of 2200mm between the posts will not allow it.
I Beams cannot be used for verandah heads.
I tried Gluelam 8 beam and it showed a 165x80mm would be needed.
Stick to Hardwood
According to this span table, a 320x65 GL8 will do that span in one go.
That's a big/heavy/expensive stick of timber though.
Could i get away with using a 145x45 tp or a 190x45tp ans span 2200mm
A 120x45 in F5 or F7 will span 2400 with a 1000 1/2 rafter span, which is what you've got, but you're right on the edge, so going up to 140x45 would be a good idea.
If you want to span the full width, an open web girder (can you even still get them? :- ) or a universal beam would do it but would be pricey.
You generally can't get 120x45 off the rack, so they'd probably be ripping down a 140 and charging you even more for the time involved.
What size LVL or GL beam could i use to span 4400mm
hi, just stuck a 4400 beam, 600mm rafter spacings, 1.3m roof load width for verandah beam - supporting ceiling into hynes deign prog and got 200/45 LGL or 170/65 LGL to span that. It can be ordered in H3 treatment
Smorgon LiteSteel Beam LSB might help. They are light, and easier to work with than rolled steel sections.
Cheers
Pulse
Ended up using a 240 x 63 LVL and encasing it in blue board
When spanning beams like that I would have preferred an LVL also. Probably would have gone for a 300x63 LVL though.Quote:
Originally Posted by srohara
Why put in more than you have to?Quote:
Originally Posted by DvdHntr
According to the tables he's alright, and I'm sure there's plenty of margin before any failure. At least 2:1 I'd imagine, but probably a whole lot more than that.
I just like to have very limited deflection over openings like that. Plus without the table that was my first guess. If I had a proper look at it and the 240 was less than 8mm deflection long term, I would have went for it.Quote:
Originally Posted by pawnhead