Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Roof dead load tables uk.
Arch 331 note set 13 1 s2014abn 2.
Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load.
This table is for a dead load of more than 0 25 but not more than 0 50 and allows for an imposed loading of no more than 1 5 kn sq m.
D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids.
For pitched roofs flat roofs and ceiling joists.
The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings.
Not more than 0 50 kn m2 3 27m.
This should be compared to the table.
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.
Standard loads of materials.
3 3 dead loads dead loads consist of the permanent construction material loads comprising the roof floor wall and foundation systems including claddings finishes and fixed equipment.
Surveyors span tables for designing roof rafters.
Steelbeamcalculator co uk has a shopper approved rating of 4 7 5 based on 1184 ratings and reviews.
Dead loads kn m2 excluding self weight of joist more than 0 75 but not more 1 00 kn.
You need to measure the complete span of your floor joists together with the distance between them the centres and the size of the timbers.
Schedule of permanent loads commonly found in residential properties.
Dead loads kn m2 excluding self weight of joist 150.
To put this in context max permissible clear spans for joists for flat roofs with unlimited access imposed load 1 50 kn m2.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
The following table provides typical weights dead load self weight for various roofing materials where possible the values were taken directly from manufacturer technical data sheets and are the actual weights of specific representative products.
