Lead Flat Roof Construction Details

Wood core roll as used on ridges hips and flat roofing wood core roll is to be used to allow for the expansion and contraction in lead sheet and flashing.

Lead flat roof construction details. Lead code is a way of combining thickness and weight very handy to know if you re thinking about lifting it off your van and onto a roof. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. Lead for the purpose fitting to a roof or bay window really starts at code 4 in theory if the roof is small enough you could use code 3 but this would normally be classed as a flashing lead i e. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.

N gives a permanent flexible and waterproof joint. However even with the best of materials poor design often leads to failure. One particular problem which has been the subject of increasing concern speculation and debate is the tendency for condensation on the underside of metal roofs to cause corrosion. It is shaped to prevent wind lift.

N avoids problems of cracking and lack of adhesion associated with mortar joints. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Flat lead roofs should be laid with a slight fall. N recommended by the lead sheet association.

For additional stability you can also use steel joists that are built into one or both of the walls. Wood core roll is used for joining bays of lead roofing also on steeply pitched roofs and lead cladding where a bold joint appearance is preferred. An acid cure will give rise to white tains on the lead s n life expectancy of 20 years. Small over flashings or leak soakers.

In general a warm roof is preferable from a construction angle but it does lead to a higher roof profile which isn t always acceptable from a planning perspective there a number of variations of the warm roof referred to as hybrid roofs which introduce different elements. Thicker lead is used on longer bays joints along the length should be stepped to prevent rain seeping up through capillary action. Lead should be laid in bays sections with joints between the bays formed over a wooden roll. Our basic fitting guides are designed to assist installing rolled lead sheet in a range of roofing applications including flashings valleys gutters and flat roofing.

From there the flat roof system you choose will determine the materials you apply. Lead sheet one of the oldest and most durable roofing materials has been known to last for over 200 years. This will give additional stability to the roof structure. N designed for lead masonry and lead brick pointed work.