applying render to timber frame property

Timber frame properties and EWI

Timber-frame properties are constructed of heavy-weight timbers which are used to form the building shape and are then fitted together to create joints. This building method is most prominent in cold climates and has been around for thousands of years. An added bonus of timber construction is that as long as trees are planted in place of the used ones, timber construction can be very green and environmentally friendly. So, pair this with an EWI system and you can count yourself as doing your bit towards the environment!

Timber frame structures are built to be tightly sealed against water and moisture and are built as part of a dry construction process where once weather-tight, the timber needs to dry out before the walls are further constructed.

Timber frame houses, however, do heat up and cool down much faster and aren’t as naturally energy efficient, so insulation is very necessary. These days, timber frame houses are constructed with wall boards backed with aluminium foil, but this is difficult to do if you live in an already-built, older property. Insulation is also vital to timber frame properties because damp and mould can be detrimental to the structural integrity of the building.

External wall insulation is perfect for timber frame houses, as cavity wall insulation is an immediate no-go zone when it comes to timber frames. Read on to find out how you would insulate and render a timber frame house!

EWI and render for a timber frame property

When externally insulating a timber frame property, the EWI system that you want to choose ideally consists of the most breathable materials. For example, the Wood Fibre insulation with our Silicone Render system.

Wood Fibre is a great option for timber frame properties because it is made from waste timber shavings. It is highly breathable and vapour permeable, so water vapour can escape through the material (which is what you want with timber frames to avoid excessive build-up of moisture). Timber is slow burning and Wood Fibre insulation actually chars rather than fully burning away, which smothers the flames and thus slows down the spread of fire.  

We also recommend that during installation you use the DuPont™ Tyvek® FireCurb® Housewrap which will add an extra layer of fire protection and vapour permeability!

Your choice of render on timber frame properties is especially important as well. You maybe wouldn’t want to go for acrylic render, for example, because this is the least breathable. Technology has greatly improved the breathability of renders. We know that coloured renders are extremely popular these days but breathability is something that cannot be sacrificed when it comes to a timber frame property, so we recommend the use of Silicone render. This is a high tech, thin-coat render with vapour permeability and breathability. Silicone render is also perfect for timber frame properties as it will resist organic growth such as algae and mould – further protecting your timber frames!

We recommend that with timber frame properties, you use our EWI-225 Premium Adhesive because again it is breathable, high strength, water-resistant and has high elasticity.  

How is external wall insulation installed onto a timber frame property?

So how is this all applied to the timber frame? Well, ideally with a Wood Fibre EWI system: the DuPont™ Tyvek® FireCurb® Housewrap will be stapled onto the OSB board, then Wood Fibre will be laid over the top using stainless steel wood screws to secure it. After this, the Premium Adhesive is used as a basecoat on top of the Wood Fibre, and then finally primed and finished with a Silicone render. 

Looking to compare all of the insulation options for your property? Our complete guide to our range of insulation materials is one click away.

Will EWI on a timber frame property take away from its appearance?

Many people think that if they install EWI onto their property then it will take away from the unique characteristics of the property. In fact, this just simply isn’t the case, because unique elements of your property can be recreated using materials which mimic the previous look of the property.

For example, on timber frame properties you may have exposed beams. This can be recreated using our wood panels which are made using a wood effect render, created with a silicone mold and then painted the equivalent colour. Brick patterns can also be recreated using our brick slips which come in a variety of different shades. You can also recreate pebbledash using the EWI-235 Dash Receiver (although not many people are that keen on it – check out our blog on how to replace pebbledash with coloured render!).

If you are a timber frame homeowner and EWI is of interest to you, then do get in touch with us here at EWI Store. We can put you in touch with an installer local to you and we can give you an estimated quote for materials. We are also always happy to give technical advice!

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