3 4 Roof Decking Plywood

Roofs with very heavy loads may require 3 4 inch thickness.

3 4 roof decking plywood.

It becomes soft and weak when it delaminates. Regardless of thickness the plywood should be a type suitable for exterior use graded exterior or exposure 1. X 96 in plywood is a powerful structural product plywood is a powerful structural product used where strength and stiffness are required for subfloors wall or roof sheathing and do it yourself projects. 3 distance a 4 ft in most cases 10 of least building width or 0 4 times building height whichever is smaller but not less than either 4 of least building width or 3 ft.

Ps 1 see table 2. A few other downsides to plywood. The plywood fire classification is class c with a flame spread of 76 200 and the smoke development of 450 max. For other conditions the loads should be appropri ately adjusted using the factors given.

Cost of 4x8 sheet of 3 4 plywood asked by lee november 11 2020. 3 overhang 3 overhang. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. The tables also assume dry conditions normal duration of load and untreated plywood with interior glue.

Fir sheathing plywood actual. Table 3 applies to sanded grades such as a d and b d. Both osb and plywood absolutely hate water lipinskiy mentions going on to say that the most important part regardless of which decking option you choose is that all penetration points on a roof are sealed. I chose this option because at 24 oc my first home showed cupping at this span and did not want to have that occur again on my 4th home.

You say my builder is using 3 4 plywood roof sheathing that is stamped with a span rating of 40 20 and the gc thought that was a minimum so he went up one size it s been a lot of years since i was on a roof that was being sheeted but if memory serves plywood stamped 42 20 was 5 8. I did use 3 4 t g for roof sheathing on a 24 oc room in truss 12 12 pitch off an articulated boom lift. Easiest roof i have sheathed to date and most stout. For instance roof loads based on bending and shear stress may be increased 15.

Historic building in downtown montgomery al with rotted out 1 x 6 roof deck boards. Because of its construction some manufacturers actually make larger sheets of osb.