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NI-wide·Technical Booklet D Structure

Single family houses, annexes and small single storey buildings

NI-wide·Technical Booklet D Structure

For a single family house of not more than 3 storeys in height, an annex or a small single storey building, a designer may wish to follow the guidance given in Section 4 of this Technical Booklet to d

NI-wide·Technical Booklet D Structure

Annex – a single storey adjunct to a house (e.g. a veranda, garage, tool shed, fuel store, lavatory etc.) with dimensions not greater than those given in paragraph 4C.40.

NI-wide·Technical Booklet D Structure

Dwelling – has the meaning assigned to it by regulation 2 in Part A of the Building Regulations.

NI-wide·Technical Booklet D Structure

For a house of not more than 3 storeys in height, an annex or a small single storey building, an alternative way of meeting the requirement of regulation 30 in Part D is to follow the recommendations

NI-wide·Technical Booklet D Structure

BS 8103: Part 1.

NI-wide·Technical Booklet D Structure

BS 8103: Part 4.

NI-wide·Technical Booklet D Structure

BS 8103: Part 3.

NI-wide·Technical Booklet D Structure

BS 8103: Part 2.

NI-wide·Technical Booklet D Structure

Table 3.1 Building classes Class Building type by height, floor area and/or occupancy 1 Single family houses of not more than 4 storeys Agricultural buildings Buildings into which people rarely go,

NI-wide·Technical Booklet D Structure

For a Class 1 building, provided the building has been designed and constructed in accordance with the publications specified in Section 2 or, in the case of a single family house of not more than 3 s

NI-wide·Technical Booklet D Structure

Houses, annexes and small single storey buildings

NI-wide·Technical Booklet D Structure

This Section applies to a single family house of not more than 3 storeys in height, an annex, and a small single storey building other than a dwelling.

NI-wide·Technical Booklet D Structure

This section is presented as follows — 4A Basic requirements for stability. 4B Timber floor, ceiling and roof members in a house. 4C Masonry walls. 4D Proportions for masonry chimneys above the roof s

NI-wide·Technical Booklet D Structure

The dimensions of a timber floor, ceiling or roof member may be determined by following either – (a) the guidance given in "Eurocode 5 span tables for solid timber members in floors, ceilings and roof

NI-wide·Technical Booklet D Structure

The stability requirements in paragraph 4A.1 should be complied with when using this Section.

NI-wide·Technical Booklet D Structure

The dimensions of a timber member may be determined by this Section where – (a) the dead and imposed loads to be sustained by the floor, ceiling or roof of which the member forms part, do not exceed t

NI-wide·Technical Booklet D Structure

Strength classes, species, grades and species combinations referred to in this Section are as defined in BS 5268: Part 2.

NI-wide·Technical Booklet D Structure

Cross sectional dimensions given in the tables to this Section are applicable to either basic sawn or regularised sizes as defined in BS EN 1313 -1. Reference should be made to the accompanying notes

NI-wide·Technical Booklet D Structure

Notches and holes in simply supported floor and roof joists should be within the limits shown in Diagram 4B.1. No notches or holes should be cut in roof rafters, other than at supports where the rafte

NI-wide·Technical Booklet D Structure

Bearing areas and workmanship should comply with the relevant requirements of BS 5268: Part 2 and to the lateral restraint provisions given in paragraphs 4C.21 to 4C.24.

NI-wide·Technical Booklet D Structure

Tables 4B.5 and 4B.6 give the maximum clear span for floor joists using timber strength class C16 and C24 that will support the dead loads specified and a maximum imposed floor loading of 1.5 kN/m2. P

NI-wide·Technical Booklet D Structure

Softwood tongued and grooved floorboards 16 mm thick will safely support this floor loading if the spacing of the joists is not greater than 500 mm. Floorboarding 19 mm thick is required if the spacin

NI-wide·Technical Booklet D Structure

These tables can be used when a bath is to be installed provided the joists directly supporting the bath are doubled-up.

NI-wide·Technical Booklet D Structure

The section sizes are either sawn across the timber thickness in accordance with tolerance class 1 of BS EN 336 and processed in accordance with tolerance class 2 of BS EN 336 across the timber width

NI-wide·Technical Booklet D Structure

If the end of a joist is supported on masonry, the end bearing should be increased from the 45 mm shown in Diagram 4B.3 to not less than 90 mm to provide restraint to the masonry wall.

NI-wide·Technical Booklet D Structure

Table 4B.5 Maximum clear span of floor joists (m): Timber strength class C16 C16 Size of joist (mm x mm) with Dead Load [kN/m2] excluding the self weight of the joist at three load levels: - Not more

NI-wide·Technical Booklet D Structure

Table 4B.6 Maximum clear span of floor joists (m): Timber strength class C24 C24 Size of joist (mm x mm) | Dead Load [kN/m²] excluding the self weight of the joist Not more than 0.25 | More than 0.2

NI-wide·Technical Booklet D Structure

Tables 4B.11 to 4B.34 give the maximum clear span of common or jack rafters and the purlins that provide support to the common or jack rafters using timber strength class C16 and C24. The sizes, spac

NI-wide·Technical Booklet D Structure

When the dimensions A and B in Diagram 4B.5 are not equal the rafter should be sized for the greater dimension. Where the purlin is continuous over an intermediate support and the spans are not equal

NI-wide·Technical Booklet D Structure

In the tables for rafters, the permissible clear spans are for rafters simply supported between a purlin and wallplate or between a purlin and the ridgeboard. However, in the tables for purlins, the p

NI-wide·Technical Booklet D Structure

Notching or drilling of a rafter or purlin should not be carried out unless justified by a specialist calculation. This does not apply to the birdsmouthing of a rafter to a depth not greater than one

NI-wide·Technical Booklet D Structure

The section sizes given in the tables are either sawn in accordance with tolerance class 1 of BS EN 336, or are CLS/ALS processed sizes in accordance with tolerance class 2 of BS EN 336.

NI-wide·Technical Booklet D Structure

the minimum bearing length for supports should be 35 mm for rafters and 50 mm for purlins

NI-wide·Technical Booklet D Structure

the tables are applicable to purlins installed perpendicular to the roof slope, whereby any horizontal thrust sustained by the rafters is restrained by the ceiling joists, or by other means

NI-wide·Technical Booklet D Structure

Table 4B.17 Maximum clear span of rafters (m); Roof pitch more than 15° but not more than 22.5°; 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.18 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 15° but not more than 22.5°; 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.23 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 C16 Dead Load [kN/m2] excluding the self weight of the

NI-wide·Technical Booklet D Structure

Table 4B.24 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 C16 Dead Load [kN/m2] excluding t

NI-wide·Technical Booklet D Structure

Table 4B.35 Maximum clear span of flat roof joists (m); Access only or cleaning and maintenance; 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.36 Maximum clear span of flat roof joists (m); Access only for cleaning and maintenance; Imposed load 0.75 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding the self weight of

NI-wide·Technical Booklet D Structure

Table 4B.37 Maximum clear span of flat roof joists; Access only for cleaning and maintenance; Imposed load 1.00 kN/m²; Timber strength class C16 C16 Dead Load [kN/m²] excluding the self weight of the

NI-wide·Technical Booklet D Structure

Table 4B.38 Maximum clear span of flat roof joists (m); Access only for cleaning and maintenance; Imposed load 1.00 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding the self weight of

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

This Part of the Section applies to a single family house that is not more than 3 storeys in height. The walls considered are as follows – (a) external walls; (b) internal loadbearing walls; (c) compa

NI-wide·Technical Booklet D Structure

External walls sized using this Section are not necessarily suitable for the support of building mounted wind turbines. Specialist advice from a suitably qualified person must be obtained to confirm t

NI-wide·Technical Booklet D Structure

For stability, the maximum floor area enclosed by structural walls complying with the provisions of paragraphs 4C.9 to 4C.30 should be – (a) 70 m2 where there are structural walls on all four sides; a

NI-wide·Technical Booklet D Structure

The maximum imposed loads on each element of the building should not exceed those given in Table 4C.1. Table 4C.1 Simplified maximum imposed loads Element | Loading --- | --- Roof | distributed load

NI-wide·Technical Booklet D Structure

Table 4C.6 Declared compressive strength (N/mm²) of masonry units complying with BS EN 771-1 to 5 Masonry unit: Clay masonry units to BS EN 771-1, Calcium silicate masonry units to BS EN 771-2, Aggre

NI-wide·Technical Booklet D Structure

Table 4C.7 Normalised compressive strength (N/mm²) of masonry units of clay and calcium silicate blocks complying with BS EN 771-1 and 2 Standard Condition Group 1 masonry units Group 2 masonry units