Roof Sheathing 1 8 Expansion

10d box nail to assure accurate and consistent spacing.

Roof sheathing 1 8 expansion.

A 1 8 inch space between adjacent panel end and edge joints is recommended unless panel manufacturer indicates otherwise. Some older h clips do not provide a built in gap. Provide 1 8 minimum space at panel ends and edges. The inspector told the guy that it could pass if he blocked the gaps on the entire roof deck.

It adds proven performance and durability to new homes room additions and renovations. Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for. For improved performance consider thicker roof sheathing panels panel edge clips or panels with tongue and groove edges. The standard gap is 1 8.

Raise the sheathing 1 8 inch above the previous row and nail it into place. Complete the second row offset one rafter width from the first then move onto the third row and so on until the last. Without this full gap sheathing can expand under moist conditions and you can end up with the sheathing warping. Unless it s t g ply getting the sheets to 0 gap is almost impossible.

Probably the best way to explain it to your contractor is to tell him it s the recommendation of the apa and most building codes. Apa recommends a 1 8 inch space between panel edge and end joints. Install with the long dimension or strength axis of the panel across supports and with the panel continuous over two or more spans. Help prevent sheathing warping our clips leave a precise 1 8 gap created from a full width spacer bar.

Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content. The osb sheathing we get locally has an installation stamp on its down side that states 1 8 minimum gap at ends and sides. That can mean costly time consuming callbacks. 1 8 gap is 1 16 per sheet side.

H clips provide additional stiffness between bearing points for the unsupported edges of wood panel plywood or osb roof sheathing along with the necessary 1 8 gap for expansion as shown below illustrated on a bag of simpson h clips. No need to cut. Not always required but a good idea. An easy way to keep it consistent is to space the sheets with a common framing nail.

Use a spacer tool i e. If the wood structural panels are tightly butted there is no room for expansion and buckling can occur. Panel end joints shall occur over framing.