Flat Roof Details Pdf

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Flat roof details pdf.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. Warm and cold roofs householder s guide to flat roofing in a flat roof the waterproofing is always supported by a structural roof deck. This could mean flat roofs may not raise the same red flags they used to. The overhang of the roof at the wall is called the eaves.

100 dan road canton ma 02021 phone 1 800 451 2504 sales 1 800 576 2358. That will help you remember certain factors and details to build the best possible flat roof. Flat roof construction for residential. So in reality flat roofs are never totally flat but rather have a slight fall the minimum of a flat roof is 1 50.

Flat roofs are hard to replace. It dealt in detail with flat roof constructions and can be regarded as one of the first guidelines for such roofs fig. Location page 5 factors such as the amount of sunshine temperature surrounding buildings or wind affect a flat roof and need to be considered. Pac ss ridge vent slope to high wall spec sheet download.

Valley detail clip valley detail one piece vented ridge detail. A roof must have some slope in order to shed rainwater. Slope to flat roof spec sheet download. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

The ceiling if any is usually fixed directly to the underside of the joists. Factors that affect a flat roof construction. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. Airtightness page 7 very good levels of airtightness are required for all flat roof constructions.

It is more accurate to describe such a roof as semi flat. A blower door test is strongly recommended. This is usually a timber boarding of some type which in turn is supported on joists. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.