For many years, the most prevalent form of timber framing has been the open panel system. This consists of a network of wooden studs, sheathed on the external side with sheet material (usually oriented strand board) and a vapour membrane, and pre-cut for window and door openings.
Once the panels are erected on site and the building is weathertight, the service runs and insulation are installed, and the unboarded side is sealed with plasterboard (or a similar product).
While it’s a tried-and-tested method, open framing leaves a fair amount to be done by your contractors on site. More recently, the scales have started to tip towards closed panel techniques, especially in the self build market.
With this route, there’s a greater element of pre-manufacture – put simply, more of the work is done in the factory, so there’s much less to manage when the project gets to site.
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What is closed panel timber frame?
Just as with open setups, a closed system will be delivered as a package of partially-finished panels – loaded onto lorries in the order they’ll be needed on site. As well as the loadbearing wall elements, you’ll also receive the roof trusses, floor structures and internal studwork. Some suppliers will also prefabricate elements such as dormer windows, should they be required.
Depending on whom you speak to, you’ll probably get a slightly different definition of what ‘closed panel’ really means. For some, it involves producing wall elements that are virtually fully finished in the factory, perhaps with service voids, internal plasterboard, external cladding and even windows and doors already fitted (so it’s an offsite-focused process).
For others, a panel becomes closed as soon as the insulation is factory-fitted and both sides of the sheathing are installed.
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Article reference Self Build Systems: Closed Panel Timber Frame
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