LogCabinHouse-Whitchurch

LogCabinHousePlans

Specification for the proposed development

 

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COMPONENT SPECIFICATION

 

TIMBER FRAME SUPERSTRUCTURE SPECIFICATION FOR APARTMENTS / HOUSES

OVERSITE FLOOR CONSTRUCTION

DPC                             225mm wide 500 mm visqueen embossed polythene

Sole Plate                   2No. 38 x 89/140mm stress graded CLS supplied in random lengths for

site fixing.

Fixings                         Sole plates fixed using hamma drive screws or similar at centres dictated

By our engineer.

Over-site construction and floor finishes and DPM’s fixed by others must be within TRADA recommended tolerances.

WALL PANELS

External Wall Panels (Treated) 38x140mm

Prefabricated Panels   38x140mm C16 CLS kiln dried, factory fabricated,                                                                 timber framing with timber studs secured at 600mm                                                                        maximum centres

External Boarding        9mm OSB (Orientated Strand Board) nail fixed to                                                                   the timber studwork

Breather Membrane     Proprietary BBA approved breather membrane                                                                                   factory fixed to external sheathing by stainless steel                                                                      staples fixed through white polystrap tape to distinguish                                                                      wall tie positions

Timber Beams/ Lintels Structural beams/ lintels factory fixed for the timber                                                                superstructure only as dictated by Structural                                                                                     Engineer’s recommendations

Head Plate                  38x140mm C16 CLS kiln dried timber supplied in                                                                   loose lengths for site fixing

Window/ Door Closers  38x89mm timber closer to window cill

Party Wall Panels (Treated) (does not apply to individual houses)

Prefabricated Panels   38x89mm C16 CLS kiln dried, factory fabricated,                                                                               timber framing with timber studs secured at 600mm

maximum centres

Racking (If required)    9mm OSB (Orientated Strand Board) nail fixed to                                                                   the timber studwork on the cavity face where dictated                                                                         by Engineer’s recommendations to provide relevant

racking

Head Plate                  38x89mm C16 CLS kiln dried timber supplied in

loose lengths for site fixing

Cavity Closers              65mm flexible cavity barriers supplied in 1200mm

lengths to suit a 50mm wide cavity

Internal Load Bearing Wall Panels (Treated)

Prefabricated Panels   38x89mm C16 CLS kiln dried, factory fabricated,                                                                               timber framing with timber studs secured at 600mm                                                                   maximum centres

Sheathing (If required) 9mm OSB (Orientated Strand Board) nail fixed to                                                                   the timber studwork on the cavity face where dictated                                                                         by Engineer’s recommendations to provide relevant                                                               racking

Timber Beams/ Lintels Structural beams/ lintels factory fixed for the timber                                                                superstructure only as dictated by Structural                                                                                     Engineer’s recommendations

Head Plate                  38x89mm C16 CLS kiln dried timber supplied in                                                                                 loose lengths for site fixing

Internal Non Load Bearing Wall Panels (Treated)

Prefabricated Panels   38x89mm C16 CLS kiln dried, factory fabricated,

timber framing with timber studs secured at 600mm

maximum centres..

All internal non load bearing wall panels are sized from finished floor to the underside of the timber joists/ trusses, but fixed tight to vertical load bearing studs on plan. All wall panels will have factory fabricated apertures complete with requisite timber lintels in accordance with design layouts.

UPPER FLOOR CONSTRUCTION

Engineered Timber Eco-Joists Upper Floor Construction

Floor Joists                   Engineered joist cross cut to length; bundled into                                                                   unit sets and delivered for site fabrication at 600mm                                                                        centres maximum

Header Joists               Single engineered joists or timber strand board                                                                                   cross cut to length; bundled into unit’s sets and

delivered for site fabrication

Header Beams             2No engineered joists or timber strand board                                                                           cross cut to length; bundled into unit sets and                                                                              delivered for site fabrication

Perimeter Blockings     Stress graded timber blockings where required                                                                                    structurally

Partition Junction        38x89mm sawn softwood supplied in random lengths

Noggins                       for site fixing between joists running parallel to timber                                                                        joists

Decking                       22mm V313 (P5) chipboard or similar nail fixed to                                                                 the timber joists on site to form floor diaphragm

Adhesives                    Proprietary resins and adhesives to secure decking

Waistband Paper         300mm wide proprietary BBA approved breather                                                                                membrane supplied loose for site fixing over ring beam                                                               zone to maintain external envelope integrity

Floors will have joist layouts designed in order to avoid contradiction with any vertical service ducts, should the necessary service details be available during the relevant design period.

No provision has been made for horizontal service ducts.

ROOF CONSTRUCTION (as required)

 

Trusses                         Pitched prefabricated timber roof trusses site fixed at                                                              600mm maximum centres, designed and manufactured                                                              in accordance with BS5268 Part 3

Raised Tie Trusses       Pitched prefabricated timber roof trusses incorporating                                                                       raised tie detail utilising truncated duo pitch trusses                                                                      supported by purlins complete with loose rafters site                                                               fixed at 600mm maximum centres, designed and

manufactured in accordance with BS5268 Part 3

Attic Trusses                Pitched prefabricated timber roof trusses incorporating                                                           attic truss detail utilising softwood timber bottom chord

fixed at 600mm maximum centres, designed and                                                                   manufactured in accordance with BS5268 Part 3

Wind Bracing               Ex25x100mm sawn softwood supplied in loose lengths                                                                       for site fixing in accordance with BS5268 Part 3 and roof                                                                       designers recommendations

Loose Rafters               Ex50mm C24 graded sawn softwood supplied in loose                                                                        lengths for site fixing

External Spandrels      38x89mm C16 CLS framing with vertical studs                                                                                    fixed at 600mm centres maximum. 9mm OSB                                                                                (Orientated Strand Board) boarding factory fixed to                                                                framing, complete with breather membrane staple fixed to                                                     the external face

Party Spandrels                       38x89mm C16 CLS framing with vertical studs                                                                                    fixed at 600mm centres maximum

STRUCTURAL TIMBER

All structural timber members are stress graded, regularised and kiln dried to contain an average moisture content of not more than 20% at the time of delivery. Preservative treatment is to conform to current Building Regulations and NHBC recommendations using a vacuum impregnation treatment process to repel fungal and insect damage. Floor joists, roof trusses/ timbers and internal non-load bearing partitions do not require treating.

ANCILLARY COMPONENTS

Fixings

Timber Frame                          All obligatory nails, screws and/ or bolts for assembling

 

Site erection inclusions

a)     Completed foundations/ over-site

b)     Vehicle and Plant Access

c)     Scaffolding (including necessary scaffolding certification)

d)     Hard Standings

All prices and programmes have been generated on the basis of a normal working week (Monday to Friday); working between the hours of 8.00 a.m. and 5.00 p.m. Weekend working may be arranged with the customer.

Adjustments to the stipulated working hours may have both a financial and timescale impact.