Wood Blocking On Roof

Traditionally blocking has been manufactured from pressure treated lumber.

Wood blocking on roof.

Interior walls are within a climate controlled environment and are presumed to be free of moisture. Pressure treated wood is required whenever you attach framing lumber or furring strips directly to concrete or other exterior masonry walls below grade. Awpa u1 provides specifications for non copper based waterborne preservative systems that have been found to not corrode metal. Wood nailers must be adequately fas tened to the substrate below to resist uplift loads.

Cca treated wood had been used successfully since the early 1930s and became accepted as a reliable performer when used as blocking and nailers in roof assemblies. An important roof component at the perimeter area that is often overlooked is blocking material. Wood blocking has long been used as an anchoring substrate for metal edge and flashing components such as expansion joints curbs and accessories. Struction details illustrated in this manual depict wood nailers and blocking at roof edges and other points of roof termination.

Roof construction including girders trusses framing and decking. Untreated wood is permitted in. In buildings of type ia construction exceeding two stories in height fire retardant treated wood is not permitted in roof construction when the vertical distance from the upper floor to the roof is less than 20 feet. Fire retardant treated wood shall be permitted in.

An important roof component at the perimeter area that is often overlooked is blocking material. This especially is true at parapet walls and copings and roof edges where edge metal shapes are fastened to wood blocking. Wood blocking shall be attached to resist wind forces and other loads as required by chapter 16 high velocity hurricane zones of the florida building code building. Traditionally blocking has been manufactured from pressure treated lumber.

Note that this requirement is only for exterior walls as these may wick moisture onto the lumber. 3 2 fastener value fv 3 2 1 fasteners anchors which have pub lished withdrawal resistance values generated from laboratory testing shall have a margin of safety as noted. Construction industry as a component in roof assemblies. Blocking or nailers used to support fixtures railings cabinets and support of interior and exterior finishes furring strips as permitted in ibc section 803 11 combustible exterior wall coverings balconies and similar projections and bay or oriel windows in accordance with ibc chapter 14.

Wood blocking has long been used as an anchoring substrate for metal edge and flashing components such as expansion joints curbs and accessories.