Lead Flat Roof Dormer

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.

Lead flat roof dormer.

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. Lead on flat roofs oxidising. However it doesn t usually last much longer than 10 years. The larger a dormer is the lower its cost per square foot will be.

More about lead as a building material. Some recent work carried out by w s everitt lead roofing. With a shallow roof pitch often clad with slates a flat roofed dormer will look much better than one with a pitched roof. The top layer is covered with gravel which protects the roof from ultraviolet rays.

Loft conversions 12 286 views. 24 500 for dormer 16 wide x 14 deep. Lead is commonly used for flat roofs because of it s long life and ability to be formed to fit many positions lead must be laid and formed correctly to achieve this long life however. 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.

Flat roof dormer cost. It is also wise to allow the roof of the dormer to follow the style of the main roof i e. The lead flashing at the end of our roofs which seals the edge where chimneys and dormer windows meet the roof keeps water out but if it has blown loose or been damaged it can fail and let water come in. Correctly laid lead roof greyfriars roofing note the height of steps between bays the rolled joints and adequate overlaps problems.

When it comes to flat roof repair options simple patch repairs for flat roofs such as those on garages or extensions. 80 125 per square foot or 17 900 to 28 000. Hips with hips and gables with gables. The temperature of lead on a roof varies constantly.

Average cost and size. Single ply flat roofs are made from one layer of materials that are a bit like rubber. When the lead rests directly onto sawn timber on a steeply pitched roof and non resinous timber has been used underlay may not be necessary. 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 bay windows and door hoods 48 49.

A dormer placed in a hipped gable should also have a hip otherwise it will look very odd. 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. 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.