Expansion joints shown on this page are designed to allow independent movement of the roof structure. This joint must also be used at the junction of low and high rise buildings. Metal is used to waterproof these joints.

In Fig A the expansion joint is between a concrete curb and a concrete wall. Composition base flash ings are brought up over the top of the curb. A counter flashing is nailed through the base flash ing into the wood nailer.

The expansion joint cover is anchored to the con crete wall and extends past the counter flashing to allow for roof movement.

Joints between lengths in this cover are lapped and sealed. Corners are mitered and sealed.

Please call about counter flashing over expansion joint covers.

The expansion joint in Fig B is between a wood curb and a masonry wall. Composition base flash ings are brought up over the top of the curb. The counter flashing is formed to serve also as a con tinuous cleat. Counter flashing is nailed through the base flashing into the wood curb.

The expansion joint cover is hooked over the continuous cleat and inserted into a flashing re ceiver. Call for detail of receiver. Joints between lengths in the cover are lapped and sealed. Corners are mitered and sealed.

Minimum recommended gage is 22 ga galvanized steel, 16 oz copper, 0.050 in. aluminum, and 24 ga stainless steel.