Lead Flat Roof Detail

Others would treat even steeper pitches as flat roofs.

Lead flat roof detail.

A new lead bay fitted in a simple one piece bay like this one the lead is nailed into the upstand underneath the guttering the drip is then beaten nice and tight over the edge of the roof and trimmed to about 50mm. It is shaped to prevent wind lift. Lead is used to make flashings soakers and trays for example around chimneys and dormers. Note no nails in the edge.

On a low pitch roof where the lead isn t free to move it is more likely to buckle on expansion or stretch as it contracts. 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 sheet is a soft and malleable metal which means it s an excellent roofing material because it can be formed and shaped to suit any detail. The temperature of lead on a roof varies constantly.

When a hot roof surface is suddenly cooled by rain the pressure in the area between the vapour barrier and roof covering can fall below atmospheric pressure. Where a flat or pitched roof over an enclosed area abuts a wall or a balcony abuts a wall cavity trays should be linked to the flashing to prevent water penetrating into an enclosed area. 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. Where a pitched roof abuts the wall at an angle.

Horizontal flashings should provide weathering to a minimum of 75mm above the intersection with the roof. Roll detail at drips and abutments 41 flat roof roll and drip intersections 42 pitched roof joints and fixings 43 pitched roof intersection with valley 44 vertical cladding joints and fixings 45 vertical cladding head finishes 46 dormer windows jambs and s ill 46 dormer windows tops jambs soffit and side cheeks 47. 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. Investigative work carried out on warm roofs covered in lead has shown that in rare instances moisture can also be introduced by the development of sub atmospheric pressure in the roof space.

For roof detail the gauge of lead to be used will be dependant upon the application. Used to join lead together into smaller pieces reduce expansion and contraction issues create up stands and troughs provide. However it is important to follow the basic principles of sizing and fixings as indicated in the rolled lead sheet manual to reduce the effects of fatigue cracking or creep. For sadles near ridge detail or for valley construction at a roof intersection where one pitch joins another.

At vanguard roofing we can install rolled lead sheet roof coverings for bays and panels.