Roof Timber Sizes Building Regs

When installing or repairing a flat roof you must adhere to building regulations.

Roof timber sizes building regs.

Imposed loads roof snow load and short term point load altitude not exceeding 100m. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings. Building control guidance note domestic timber floor sizes and construction details. For pitched roofs flat roofs and ceiling joists.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Building control guidance note 18 purlin and rafter roofs timber sizes and construction details. Ideally this should be done after the roof has been installed. Also the new sound insulation regulations restrict the building in of joists into party walls between.

Building control guidance note planning regulations created date. Building regs drawings specifications and guidance for building control. Pitched roof timber sizes. Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes.

Domestic timber floor sizes and construction details keywords. Guidance on the sizing of timber floors and roofs for traditional house construction removed as the timber tables are now. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74. Building control guidance note 18 author.

Suitable for uk building regulation approval. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Pitched roofs overview.

In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable. All roof timbers including joists wall plates blocking strutting battens firings and noggings must be to be preservative treated unless the timber used is naturally durable. The function of a roof is to protect the building below from the weather. These things will affect the timing cost and overall running of your project.

Sizes of certain timber members in floors and roofs for dwellings. Common joists sizes are 200 x 50mm 175 x 50mm and 150 x 50mm. The building regulations 2010 isbn 978 1 85946 508 0 stock code 80581.