Please note iWood is a wholesale timber merchant and we have a minimum order of £350.00 ex VAT (£420.00 inc VAT).
1) Click to choose a Shiplap Cladding profile
Thermowood is quite knotty and is a dark brown in colour. It's durable, stable and takes a paint well.
2) We offer Thermowood in the following grade:
IWC6 Ship-lap 145mm (135 face) x 19mm
IWC7 Ship-lap 145mm (128 face) x 19mm
3) How much Thermowood Shiplap Cladding do you need?
Sawfalling is a knotty grade of timber. Most will be sound, however, we recommend ordering 10% extra for cutting around any dead knots.
Example Pricing for Thermowood Shiplap Cladding
Priced from £47.88 ex. VAT (£57.46 inc. VAT) per square metre (Profile: IWC6 Ship-lap Cladding - Grade: Sawfalling - 1m 2)
Thermowood Shiplap Cladding
Thermowood Shiplap Cladding
Thermowood Shiplap cladding is a great material for external cladding, it is highly durable and is very stable due to the treatment that the timber has undertaken. Thermowood is a Scandinavian Pine which has been heat treated to remove as much moisture from the wood as possible. This makes the timber more stable, so it doesn’t warp as much as it would and has the added bonus of removing any resin which helps to prevent the wood rotting.
Thermowood is supplied as Sawfalling, so you can expect to see a large knot content. Most of these will be live, sound knots, however there is the chance for the supply to contain some dead knots as well. So, we recommend ordering an extra 10% so these knots can be cut around.
Shiplap cladding is designed to be fit horizontally on the wall and has a channel machined into the wood to allow water to run off. There are two available profiles:
Which are slightly different from each other. IWC6 is designed with an overlap whereas the IWC7 is more of a T&G hybrid, allowing for secret and face fixing.
Thanks to the process it has been through, Thermowood shiplap cladding doesn’t need painting or oiling to seal it, however if you would like top preserve the colour or stain it with a paint, the wood will take the finish well. We recommend wood finishes direct for oils and paints on timber products.
Siberian Larch Alternative
With the current state of Siberian Larch supply being put on hold, we think that Thermowood is a viable alternative. Not only is it cost effective but it offers high durability to compete with the British timbers supplied.
Our Thermowood is available as PEFC certified because it is sourced from sustainable sources.
Our fitting guidelines are designed to give you a starting point on how to fit your shiplap cladding and we recommend that you consult an expert fitter to advise on your actual scenario.
Be sure to read our treatment guidance as treatment needs to be applied prior to fixing your cladding
Consult a fitter to determine if your scenario would require the fitting of a breathable membrane between your wall and the cladding. This membrane stops rain getting to the wall, but allows moisture to escape, helping to prevent internal condensation and mould that can come with it.
Treated Softwood Battens
Treated softwood battens (available from our cladding accessories pages) are most commonly used to fix to the wall (or on top of the breathable membrane) to then fix your cladding to. Shiplap cladding is to be fixed horizontally only, so your battens need to be placed vertically, at around every 600mm (60cm).
Fixing the Cladding
** Whether you use nails or screws, it's important that they are stainless steel, or silicone bronze ARS, so that the natural tanins in the timber will not corrode them. Never use iron nails for fixing timber.
The timber is designed to only be fitted horizontally with the start of the running lip across the width of the timber at the top. To stop your wood from splitting it’s best to pre-drill any holes and then hold the boards with the head of the screw.
You can also use nails, preferably ring-shanked for extra grip, and again stainless steel so they don't corrode. For lower-density species like cedar, consider using nails with larger heads so the cladding doesn't pull through.
As already stated, these are just ideas to get you thinking about installation and you should consult a professional installer before fitting your cladding as every scenario is different.
All our claddings are provided untreated. Fresh sawn timber claddings are best left untreated and to go silver grey.
There are a wide range of optional treatments available for different species of timber and we recommend talking to the excellent team at www.wood-finishes-direct.com, who know the most up-to-date information on all the newest treatment products.
What do our customers say?
You were recommended by my builder
- Catherine Hilditch
The website is excellent and I also called your help line a couple of times to ask a few more questions and guidance and the wood experts were very helpful. Thank you.
- Sally Charter
I felt the ordering process was very straightforward, your pricing very good and response when requesting a sample was very prompt
- Steven Boyd
Have used before. Great products and service.
- Jeff Benson
Clear indication of dimensions and prices and quality. Thanks for the sample
- Peter Elliott
Architect / Design Specify
Sawfalling Thermowood External Cladding Shiplap Cladding from iWood Timber
Some commonly asked questions
Our timber is imported straight from sawmills on the continent. Our usual lead times are therefore 14 to 17 working days.
What are your delivery costs?
We calculate our delivery costs based on how far away you are from us, to get more information on this please check out our shipping costs page HERE.
Our delivery lorries visit different parts of the country on different days, so once your order is ready we will work with you to arrange a delivery day for when one of our lorries is in your area. We will always arrange the delivery day in advance with you.
We deliver weekdays Monday to Friday between the hours of 8am to 5pm. Our delivery vehicles will have multiple jobs on them which can affect the delivery time to you, depending on factors such as traffic and how long it takes to offload the previous jobs. The driver will call you in advance with an estimated time of arrival to make sure you'll be there.
How do I place an order for cladding?
You can place your order online by working out your price above and adding your items to your shopping basket. You can then check out and your order will be processed securely and a confirmation email sent. Once your order arrives in our depot, we'll give you a call to arrange delivery.
Can I Order Samples?
Yes you can, you can order samples of certain timbers at www.iwood.co.uk/sample-request/.
If the species you need isn't there please give us a call or talk to us on our online chat.
The timbers shown are planed all round samples and are not profiled.