For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.
Rafter spacing for polycarbonate roofing.
I recently replaced the original polycarbonate roofing suntuf using 26 inch by 12 foot pieces.
Rafters shall be framed not more than 1 1 2 inch 38 mm offset from each other to ridge board or directly opposite from each other with a gusset plate as a tie.
Ridge board shall be not less than 1 inch 25 mm nominal thickness and not less in depth than the cut end of the rafter.
I have a pergola measuring 16 4 by 15 2.
Solar array checks a.
Rafter slope tie spacing inches roof span feet 12 20 28 36 required number of 16d common nails per connection 3 12 12 4 6 8 10 16 5 7 10 13 24 7 11 15 19 32 10 14 19 25.
24 1 2 every 6 ft.
At valleys and hips there shall be a valley or hip rafter not less than 2 inch 51 mm nominal thickness and.
Pre cut roof rafters to desired pitch and nail into position.
Use these two tables for roof rafters with a slope of 3 in 12 or less.
Overlap roof panels one corrugation away from prevailing wind and nail to rafters starting from one end.
1 measured roof slope e g.
Both 16 inches and 24 inches are common measurements for rafter spacing.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.
Screws should be sealed in waterproof silicone sealant wiping off any surplus after driving the screws.
The roofing company used the 15 foot 2 inch side to lay the sheets longways.
Plaster below 2 tile roofing.
Drywall below 3 tile roofing.
Use aluminum nails with neoprene washers and apply mastic to overlap of one corrugation.
1 is the plane of the modules panels parallel to the plane of the roof.
24 1 2 every 7 ft.
To cover the remaining 3 feet they cut 4 foot sections and placed them under the 12 foot sheets.
Subtract that number from the width of the panel and then divide by 2 to come up with the spacing for the rafters.
Ensure the purlin spacing is not greater than 1 500mm.
2 measured rafter spacing center to center.
Adjust door construction to desired size.
Drywall below 3 lightweight roofing 4 tile.
