The building regulations 2010 isbn 978 1 85946 508 0 stock code 80581.
Roof timber sizes building regs.
Also the new sound insulation regulations restrict the building in of joists into party walls between.
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.
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 18 author.
Ideally this should be done after the roof has been installed.
Pitched roofs overview.
Building control guidance note 18 purlin and rafter roofs timber sizes and construction details.
Building control guidance note domestic timber floor sizes and construction details.
Surveyors span tables for designing roof rafters.
Domestic timber floor sizes and construction details keywords.
Structural calculations for timber joists timber beams glulam beams flitch beams using the latest design codes.
Common joists sizes are 200 x 50mm 175 x 50mm and 150 x 50mm.
The function of a roof is to protect the building below from the weather.
For pitched roofs flat roofs and ceiling joists.
Guidance on the sizing of timber floors and roofs for traditional house construction removed as the timber tables are now.
Building control guidance note planning regulations created date.
Sizes of certain timber members in floors and roofs for dwellings.
Pitched roof timber sizes.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
Suitable for uk building regulation approval.
All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.
When installing or repairing a flat roof you must adhere to building regulations.
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.
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.
Imposed loads roof snow load and short term point load altitude not exceeding 100m.
Building regs drawings specifications and guidance for building control.
