Thread: What size do the rafters have to be for my pergloa?

Hi Osbourne,

I've just has a quick look at AS1684 and this is what I reckon.

Rafters = 140x45 MGP10 Treated Pine @ 900mm centres.
Pitching Beam = 190x45 MGP10 Treated Pine supported every 3000mm.

Please check the grade of the timber you purchase as treated pine is available in F5, F7 & MGP10 these days.

Cheers,

Repco.

Thanks for that, i am also attaching the pergola to the fascia which is tin, so i will attach fascia support brackets to the roof truss. Any idea how many i would have to put on. maybe every second or third truss?

Without knowing what the capasity of the truss top cord I would probable take a punt at every 2nd truss. Use a beam/plate against the fascia to fix the rafters into which is the same size as the rafters.

Metal facia is mounted on brackits which are screwed to the side of the truss.There is a gap between the facia and truss. So you cant go through the face of the facia because when you go to tighten the whale plate off it will crush the facia. Its always a hard one with metal facia.
If you have an eave you can screw a plate to the underside and attach to that. There are several ways to go depending how fussy you want to be. Mostly I make a L shape with 2 90/45s. Then shape the rafter into the L and scride around the facia and gutter. Depends on head room.
Good luck

Doesnt the fascia supprot bracket bolt off to the truss and come down flush with the fascia on the back side?

Nar, with timber facia the truss is cut off in a straight line. the benifit of steel is it's quick. String the brackets and wack the facia on. Have a look.
But better still. If you have a carpenter mate ask for some advise or pay for some. It will save you time and money. The job will be much better and you will feel pleased with the result.

how muich head room do you have?

its about 2.21m
Ive had a look and can see what you are talking about the gap, but wouldnt the fascia bracket span that gap and sit flush on the fascia? the bracket is pretty much a 'L' shape so will bolt off to the truss and support the back of the fascia.

thakns for you help too