Wooden Timber Windows, Doors and Stairs
High Quality, Long Life, Bespoke
Deviations From Standards
Barnsdale Timber Windows are made to the highest standards and conform to relevant national and international standards. However there are some standards that are either out of date or not possible to conform to. Below are details of the clauses to which we may not conform.
BS644:2003 5.1.2 Preservation
The standard refers to BS5589 1989 Section 2. We normally use finger jointed redwood heartwood in the manufacture of our windows. Redwood heartwood was traditionally used to make long life timber windows. However, the classification of its durability relating to the current standards is arguable and therefore compliance with the standard may not be necessary. However, we treat all softwood windows with a Boron based preservative which carries a 30 year warranty provided by Azko Nobel. We recommend this process because it appears to be the most environmentally friendly product available and it performs very well with factory finished windows. Request more details.
BS644:2003 5.2 Adhesives
Where windows are finished with an opaque coating we always use Resorcinol formaldehyde. This performs exceptionally well and acts as a very good end grain sealer. However, due to its very dark brown colour we cannot use it on windows finished with translucent coatings, we therefore use D4 grade PVA adhesive with end grain sealant.
BS644:2003 6 Profile design
The standard calls for all external arrisses to have a 1.5mm radius (where practical). We generally use a 3mm Radius, as recommended by our coatings supplier, but where a traditional looking glazing detail is required (often to comply with planning requirements) this cannot be used. The coating warranty will be affected if a radius of less than 3mm is specified.
BS644:2003 8 Glazing
BS644 states that glazing should comply with BS 6262. However, BS 6262 was re-issued in 2005 and no longer specifies glazing requirements. Instead, it now refers to the glazing requirements of BS8000-7 Workmanship on building sites - Code of practice for glazing. As most of our windows need to be traditionally looking, the size of the glazing rebate has to be restricted. Therefore, we allow an 18mm rebate depth. This means that the gap between the rebate and the glass unit will be a minimum of 3mm, as recommended in BS8000-7. In order to ensure the maximum possible sealed unit life, we use an internally beaded drained and ventilated system, and 7mm x 7mm drainage groove within the rebate.
Building Regulations
There is considerable conflict between supplying windows that comply with fire escape requirements, child safety, security and ease of cleaning. Therefore, although we will specify the intended opening arrangements of sashes, the Specifier must be responsible for ensuring that the window specifications comply with the requirements of the building regulations and the local Building Control Department.