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NI-wide·Technical Booklet D Structure

Tables 4B.11 to 4B.44 give the sizes of certain roof members for imposed loads of 0.75 kN/m2 and 1.00 kN/m2. The loading applicable at a particular site depends on the elevation of that site above sea

NI-wide·Technical Booklet D Structure

The tables for the pitched roof timbers are only applicable to a building where no access is provided to the roof, other than that necessary for cleaning and maintenance, which has – (a) a roof area n

NI-wide·Technical Booklet D Structure

Table 4B.2 Simplified imposed roof loads Altitude of site above sea level (m) | Zone A (kN/m2) | Zone B (kN/m2) from 0 to 100 | 0.75 | 0.75 more than 100 but not more than 150 | 0.75 | 0.75 more than

NI-wide·Technical Booklet D Structure

Diagram 4B.2 Simplified roof snow load map showing Zone A and Zone B distribution across Northern Ireland. Where the site straddles the boundary between Zone A and Zone B the worst loading case should

NI-wide·Technical Booklet D Structure

Table 4B.20 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 22.5° but not more than 30°; Imposed load of 0.75 kN/m2; Timber strength class C16 C16 Dead Load [kN/m2] excludi

NI-wide·Technical Booklet D Structure

Table 4B.19 Maximum clear span of rafters (m); Roof pitch more than 22.5° but not more than 30°; Imposed load 0.75 kN/m2; Timber strength class C16 Dead Load [kN/m2] excluding the self weight of the

NI-wide·Technical Booklet D Structure

Table 4B.26 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 22.5° but not more than 30°; Imposed load of 1.00 kN/m2; Timber strength class C24 Dead Load [kN/m2] excluding t

NI-wide·Technical Booklet D Structure

Table 4B.25 Maximum clear span of rafters (m); Roof pitch more than 22.5° but not more than 30°; Imposed load 1.00 kN/m2; Timber strength class C24 Dead Load [kN/m2] excluding the self weight of the

NI-wide·Technical Booklet D Structure

Table 4B.28 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load of 0.75 kN/m2; Timbers strength class C16 C16 Dead Load [kN/m2 ] excludi

NI-wide·Technical Booklet D Structure

Table 4B.27 Maximum clear span of rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load 0.75 kN/m2; Timber strength class C16 C16 Dead Load [kN/m2 ] excluding the self weight of t

NI-wide·Technical Booklet D Structure

Table 4B.29 Maximum clear span of rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load 0.75 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding the self weight of th

NI-wide·Technical Booklet D Structure

Table 4B.30 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load of 0.75 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding

NI-wide·Technical Booklet D Structure

Table 4B.31 Maximum clear span of rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load 1.00 kN/m²; Timbers strength class C16 C16 Dead Load [kN/m²] excluding the self weight of t

NI-wide·Technical Booklet D Structure

Table 4B.32 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load of 1.00 kN/m²; Timber strength class C16 C16 Dead Load [kN/m²] excluding

NI-wide·Technical Booklet D Structure

Table 4B.33 Maximum clear span of rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load 1.00 kN/m2; Timber strength class C24 excluding the self weight of the rafter Not more than

NI-wide·Technical Booklet D Structure

Table 4B.32 Maximum clear span of purlins (m); Roof pitch more than 30° but not more than 45°; Imposed load 1.00 kN/m2; Timber strength class C24 excluding the self weight of the purlin Not more than

NI-wide·Technical Booklet D Structure

Table 4B.34 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load of 1.00 kN/m2; Timbers strength class C24

NI-wide·Technical Booklet D Structure

Maximum clear span of flat roof joists (m); Access not limited to the purposes of cleaning and maintenance; Imposed load 1.50 kN/m2; Timber strength class C24 Table provides maximum clear spans for j

NI-wide·Technical Booklet D Structure

Tables 4B.41 to 4B.44 give the maximum clear span of purlins supporting decking or sheeting on roofs that have a pitch greater than 10o but not greater than 35o. The timber strength class used in the

NI-wide·Technical Booklet D Structure

The tabulated purlin sizes are designed to resist only the load component perpendicular to the roof pitch with purlins installed normal to the roof pitch. Designers should ensure that the roof constru

NI-wide·Technical Booklet D Structure

clear span of purlin taken as the clear dimension measured horizontally between supports the minimum purlin bearing length should be 50 mm design spacing of purlins = (A + B)/2

NI-wide·Technical Booklet D Structure

Table 4B.43 Maximum clear span of purlins supporting decking or sheeting (m); Roof pitch more than 10° but not more than 35°; Imposed load of 1.00 kN/m2; Timber strength class C16 C16 Dead Load [kN/m

NI-wide·Technical Booklet D Structure

Table 4B.44 Maximum clear span of purlins supporting decking or sheeting; Roof pitch more than 10° but not more than 35°; Imposed load of 1.00 kN/m2; Timber strength class C24 C24 Dead Load [kN/m2] e

NI-wide·Technical Booklet D Structure

The gable wall should be strapped to the roof as shown in Diagram 4C.13(a) and (b) by tension straps as described in paragraph 4C.23. Vertical strapping at least 1 m long having a minimum cross-sectio

NI-wide·Technical Booklet E Fire Safety

If a fire penetrates a roof near a compartment wall there is a risk that it will spread over the roof to the adjoining compartment. Where a compartment wall meets a roof it should – (a) where the roof

NI-wide·Technical Booklet E Fire Safety

(e) between double-skinned, profiled, insulated, roof sheeting provided that – (i) the sheeting is a material of limited combustibility; (ii) both surfaces of the insulation layer have a surface sprea