Where the movement gap is expected to be more than 35mm it should be protected by a cover strip. Timber can be used to create a house frame using a number of different methods. This diagram shows a masonry external wall tied back to a timber frame structure using cavity wall ties. The design should detail the position and type of fire-stops in accordance with relevant Building Regulations. Timber Frame Walls An increasingly popular way of constructing new-build dwellings is to use a timber framed construction rather than traditional masonry cavity wall construction. 6.2 External timber framed walls This chapter gives guidance on meeting the Technical Requirements for external walls of timber framed homes up to seven storeys high, substantially timber framed homes and timber wall panels. The ventilation helps control the moisture levels of the timber. Finish with weberend MT system with choice of finishes. Insulation should normally be placed within the stud void. Vertical timber cavity barriers should be protected from penetrating moisture by a dpc. Joints in head binders should occur over a stud. Where wall areas are divided by horizontal cavity barriers and openings should be provided to each section (see Clause 6.2 - D7). Dwellings with a timber frame superstructure require certification indicating that the design has been checked by an NHBC timber frame certifier. This Chapter applies to timber framed walls up to seven storeys high. External Wall 1.1. Note: Due to space constraints, full specification details for panel based systems are not included in this guide. A typical fire-stop detail is shown in Clause S8. I-studs manufactured from timber of durability class 'moderately durable' or lower should be preservative treated in accordance with Chapter 2.3 'Timber preservation (natural solid timber)'. size and type of nail including material and corrosion protection. Building with timber framed construction can offer a number of advantages and benefits over building with a more traditional form of construction… Fix suitable sheathing board spaced off to create drained/ventilated cavity and finish with weberend MT. In this construction method, planks of timber (known as studs), are attached at a perpendicular angle to other pieces of timber that lie across their tops and bottoms (wall plates). Insulate the frame within the stud, provide a minimium 40 mm cavity (20 mm if backed by breather membrane or similar). For guidance on the prevention of fire during construction see 'Fire prevention on construction sites' jointly published by the Construction Confederation and the Fire Protection Association (www.thefpa.co.uk). In this construction method, planks of timber (known as studs), are attached at a perpendicular angle to other pieces of timber that lie across their tops and bottoms (wall … This information should also be made available for reference on site so that work can be carried out satisfactorily in accordance with the design and specification. This Chapter gives guidance on meeting the Technical Requirements and recommendations for external walls of timber framed dwellings, substantially timber framed dwellings and wall panels (including relevant certification procedures). A lintel and cripple studs should be provided to any opening in load-bearing panels except when the opening does not affect the stud spacing or where the supported loads are carried by a rim beam or perimeter joist. The design should take into account: Sheathing and its associated fixings should be structurally adequate to resist racking due to wind and other forces. Walls and panels shall resist the spread of fire, All relevant information shall be distributed to appropriate personnel, Design of the superstructure shall be checked by an NHBC timber frame certifier, Chapter 6.9 'Curtain walling and cladding', Chapter 2.3 'Timber preservation (natural solid timber)', of a suitable grade in accordance with BS EN 338 and BS EN 14081-1. dry graded and marked in accordance with BS 4978. a masonry cladding which is rendered or clad with an impervious material. Where proprietary products are to be used, manufacturers usually have specific requirements for fixing and/or assembly of their products. Insulate and finish with weberend MT Insulate the frame within the stud, provide a minimium 40 mm cavity (20 mm if backed by breather membrane or similar). All rights reserved. These are usually nailed into the frame, and bedded into the mortar layer. The NHBC recommend and require that a ventilated and drained cavity be installed between the cladding system and the timber frame. A drained and vented cavity should be provided to reduce the risk of rain penetrating to the frame. During the first two years after erection, the timber frame will reduce in overall height as it dries out. If you have any questions or would like assistance, please contact our technical team: Our technical team is available Monday to Friday, 8:30am until 5.00pm. Additional guidance is given in Appendix 6.2-C or in the case of gas services publications from the Institution of Gas Engineers and Managers (www.igem.org.uk). A vapour control layer should be fixed on the warm side of the wall insulation. The House Construction-The Frame post explains the background to frame construction. Typical details are shown in Clause S2. Horizontal cavity barriers (except under eaves) should be protected with a dpc tray. Timber constructions often rely on a vapour barrier on the warm internal face. Wall panels should be adequately fixed to the sole plate which in turn should be anchored to the substructure to resist all the lateral and vertical forces acting at these junctions.