tiled canopy - size of timber to use

[nick60]

evening all, I'm planning to rip down a flat-roofed canopy that covers my front door and a nearby window. The plan is to replace it with a pitch-roofed structure. Simple design with timber supports at the two front corners, tiled with mini-stonewolds to match adjacent structures.

The span between the corner posts will be 3000mm-3500mm. What size timber would you use to span this? Weight of the tiles will be 300-350Kg according to my calcs, no other loading on it. TIA

Nick

 

[^woody^]

4x2 or 3x2 for the canopy. And if you make these into mono-trusses, and fix these to the house securely, then they will generally cantilever themselves.

You could run a 6x2 through the trusses to help prevent sagging

Untitled

• ^woody^
• 4 Jul 2008
• 6

 

[joinerjohn]

I did something similar for a customer about 3 years ago. Overall length was about 5m , supported by brackets at either end and a 2,1/2m bay window in the middle. The canopy projected about 900mm from the building with a 35° pitch. I used 4"x2" for the rafters. You didn't say how far the canopy projects from the building or the pitch. These are the critical things we'd need to know to advise.

 

[nick60]

sorry folks been away for a few days .... many thanks for the inputs. Nice picture woody - I get the idea. What spacing would you use between the trusses?

Joinerjohn - projection from wall will be in the 1100-1200mm region, pitch is shallow, around 20deg which is near the limit for the tiles I'm using. My gut feel is that is that I need something substantial across that span, but as I'm not a builder or joiner perhaps my gut feel is no guide in this case ....