Flat Roof Extension Construction Details

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 roof extension construction details.

Sizes of joists needed for flat roof construction. 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. 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. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. It must provide adequate protection against the elements keeping the buildings structure and interior dry. A flat roof must be strong durable and stable throughout its lifetime. It is the standard method employed on flat roofed extensions but it is rarely used for new builds today.

Of course you don t need to live in a modern house to deal with a flat roof. Old asbestos roofs are often replaced with flat roofs. Flat roof structures offer numerous advantages from design and material options through to cost. 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. The construction of the flat roof is similar to that of the timber upper floor. They are common on extensions garages and commercial buildings. Flat roof extensions can provide a simple cost effective solution that ticks all the right boxes especially for many smaller extensions.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. Flat roof types. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. So any timber joists that are used need to be strong enough to support this weight.

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. Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. That will help you remember certain factors and details to build the best possible flat roof.