Roof Timber Sizes Building Regs

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

Roof timber sizes building regs. 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. For pitched roofs flat roofs and ceiling joists. Suitable for uk building regulation approval.

Surveyors span tables for designing roof rafters. Sizes of certain timber members in floors and roofs for dwellings. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.

Building regs drawings specifications and guidance for building control. Common joists sizes are 200 x 50mm 175 x 50mm and 150 x 50mm. 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. The building regulations 2010 isbn 978 1 85946 508 0 stock code 80581.

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. Also the new sound insulation regulations restrict the building in of joists into party walls between. Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes.

These things will affect the timing cost and overall running of your project. Building control guidance note planning regulations created date. Guidance on the sizing of timber floors and roofs for traditional house construction removed as the timber tables are now. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.

Building control guidance note 18 author. Building control guidance note domestic timber floor sizes and construction details. Domestic timber floor sizes and construction details keywords. So whether your new flat roof is to be made of timber concrete or felt or a combination of these materials you need to comply with flat roof building regulations.

Ideally this should be done after the roof has been installed. Pitched roofs overview. Imposed loads roof snow load and short term point load altitude not exceeding 100m.