Flat Roof Extension Construction Details

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.

Flat roof extension construction details. A flat roof must be strong durable and stable throughout its lifetime. Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. The construction of the flat roof is similar to that of the timber upper floor. The excitement of starting a new construction project or building venture can lead you to forget about the finer details such as planning permission and local building.

Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. So any timber joists that are used need to be strong enough to support this weight. To build a flat roof you ll want to have a thorough understanding of how the process of constructing the flat roof works and the different methods available.

Insulation for the warm flat roof only the basic construction process. Flat roof construction design flat roof construction detail flat roof construction detail dwg flat roof construction details australia flat roof construc. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. They are common on extensions garages and commercial buildings.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. Sizes of joists needed for flat roof construction. Additional construction details drawings as well as the small selection of foundation wall floor and roof construction detail drawings shown here many of the building notes have a related construction detail drawing with specific dimensions eg rafter sizes spans insulations types for purchase with the building specifications.

The comparative ease of constructing flat roof extensions and their discreet visual impact can save having to shell out for a more expensive tiled roof in many cases. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. That will help you remember certain factors and details to build the best possible flat roof. It is the standard method employed on flat roofed extensions but it is rarely used for new builds today.

Flat roof structures offer numerous advantages from design and material options through to cost. Of course you don t need to live in a modern house to deal with a flat roof. Flat roof types.