Roof Sheathing Thickness For 24 Oc

8d ring shank nails should be used instead.

Roof sheathing thickness for 24 oc.

Sheathing should be a minimum of 19 32 inch thick. Plywood thickness for 24 quot. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. The second number is the maximum o c.

It can be used for rafters up to 40 in. That means it can be used at 24 in. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. It will support roof.

Support spacing when the panel is used for subflooring. Oc rafters i have worked with cdx generic osb and advantech. Two numbers separated by a slash e g 32 16 or 48 24. Tongue and groove sheathing rated 40 20.

As far as installation goes i much prefer using osb or advantech over ply simply because it lays flat and doesn t warp curl like cdx. Around here southern mn the cities you can drive through the neighborhoods with cheaper houses the ones with trusses on 24 centers and 1 2 or 7 16 sheeting and most many will have sagged roofs. The typical thickness range for sheathing is 3 8 to 3 4 inch. Panels are rated 32 16.

2 thoughts on what thickness osb to use under shingles. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. A panel marked 32 16 may be used for roof sheathing over supports spaced up to 32 inches o c.

Huber s zip system sheathing which we are using on the fhb house has a span rating of 24 16 for 7 16 in. Never attach roof sheathing with staples. The first number is the maximum on center o c support spacing in inches for roof sheathing. For subfloors zip s 1 2 in.

However if there is ever a roof leak i think the cdx holds up better. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.