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Home > External Timber Cladding > Thermowood

Get a Thermowood Tongue and Groove Cladding price below.

Please note iWood is a wholesale timber merchant and we have a minimum order of £350.00 ex VAT (£420.00 inc VAT).
Thermowood Tongue and Groove timber cladding
Thermowood Tongue and Groove Cladding
Photo: Samples of Thermowood

Thermowood is quite knotty and is a dark brown in colour. It's durable, stable and takes a paint well.

1) Click to choose a Tongue and Groove Cladding profile

IWC1 T&G 145mm (135 face) x 19mm
IWC1 T&G 145mm (135 face) x 19mm
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IWC2 T&G 95mm (88 face) x 19mm
IWC2 T&G 95mm (88 face) x 19mm
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IWC3 T&G 142mm (125 face) x 19mm
IWC3 T&G 142mm (125 face) x 19mm
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IWC4 T&G 145mm (125 face) x 19mm
IWC4 T&G 145mm (125 face) x 19mm
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IWC5 T&G 145mm (125 face) x 19mm
IWC5 T&G 145mm (125 face) x 19mm
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2) We offer Thermowood in the following grade:

Sawfalling
Sawfalling Thermowood
Sawfalling is a knotty grade of timber. Most will be sound, however, we recommend ordering 10% extra for cutting around any dead knots.

3) How much Thermowood Tongue and Groove Cladding do you need?
Square Metres Linear Metres
OR
Supplied in lengths of 3m and longer
How to measure for cladding?
Example Pricing for Thermowood Tongue and Groove Cladding
Priced from £47.88 ex. VAT (£57.46 inc. VAT) per square metre (Profile: IWC1 T&G Cladding - Grade: Sawfalling - 1m 2)

Thermowood Tongue and Groove Cladding

Tongue and Groove Thermowood cladding is a durable timber which is exceptional for outdoor use. The timber is a Scandinavian Pine which has been heat treated through a steaming process, this process helps to remove almost all of the moisture from the timber in order to make it as stable as possible. All of the resin is also dried up which helps to prevent rotting and leaking onto the surface of the wood, leaving you with a nice clean finish.

Supplied in a Sawfalling grade, you can expect to see a fairly heavy knot content in the boards, the majority of which are sound, live knots. There can be some dead knots though, so we do recommend ordering 10% extra so you can cut these out of the board.

Unpainted Thermowood machines well so you get a smooth finish for your tongue and groove cladding, there are a range of profiles on offer including:

  • IWC1
  • IWC2
  • IWC3
  • IWC4
  • IWC5

These are a range of horizontal and vertical for with v joint and shadow gap designs. IWC3, IWC4 and IWC5 can all be secret fixed as well. Please make sure that you use stainless steel nails, and we recommend pre-drilling due to the brittle nature of the product, this will help to reduce splits in the timber.

Although you don’t need to treat the timber because of how stable it is, it does take a paint or oil well if you would like to change or preserve the colour. If you leave it, the Thermowood will naturally turn silver grey over time like all timber.

An alternative to Siberian Larch

One of the reasons we are so keen to offer this timber along with our premium range of hardwoods and durable softwoods, is so that we have a suitable alternative for Siberian Larch which is currently unavailable. With Canadian Cedar prices rising to levels we haven’t seen before it has become more important than ever to offer a cost effective and quality option.

Our Thermowood is available as PEFC certified because it is sourced from sustainable sources.

Fitting Guidance

These fitting guidelines are only a rough idea on how to fix your tongue and groove cladding. We do recommend you employ a professional who has experience fitting tongue and groove cladding.

Be sure to read our treatment guidance as treatment needs to be applied prior to fixing your cladding

Breathable Membrane

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. If you are fixing your cladding horizontally, your battens need to be placed vertically, at around every 600mm (60cm), and vice versa.

Fixing

** 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.

To help stop the wood from splitting we recommend pre-drilling the timber and then holding it with the screw or nail head when you fit the board to the batten. Look to leave a 3mm gap between the boards, rather than butting them up tight like flooring, to account for any moisture movement and make sure that the tongue is facing upwards otherwise moisture will start gathering in the groove of the profile.

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.

You can fit IWC 1,2,3 and 4 vertically or horizontally depending on the look you want from your timber. Whilst technically you can fit IWC5 horizontally, water can sit in the square channel, which is not recommended.

With each new row of cladding you add, it's preferred that you stagger the joins between each board so you don't create a visible seam.

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?
I felt the ordering process was very straightforward, your pricing very good and response when requesting a sample was very prompt
- Steven Boyd

Prices were clear to understand. My first order and went very well.
- Ernest Warren

A strong relationship exists between iWood and The Bespoke Kitchen and Interiors Ltd. The reasons are simple and constant. The product and delivery from iWood has been first class. There has been good flexibility in the size of each delivery which has enabled stock levels to be carefully controlled. Wastage has been kept to a minimum because iWood delivers exactly what is promised. This is a company that really understands us. Thanks for listening and responding so well to a small company.
- Richard Edmondson

Just a quick line to say thanks for the swift delivery of the ash I ordered a couple of weeks ago. It is now installed as stair treads/ landing and looks superb. Just one small gripe, the delivery driver didn't call me to say he was on his way which meant I had to rush over; he did help me carry it into the house though. I think the picture does them justice.
- Stephen Barker, Spalding

Clear indication of dimensions and prices and quality. Thanks for the sample
- Peter Elliott

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Architect / Design Specify
Sawfalling
Product Code: IW-18-64-21-2
Specify: Sawfalling Thermowood External Cladding Tongue and Groove Cladding from iWood Timber

Some commonly asked questions

Delivery times

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.

Delivery day

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.

Delivery times

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.

Still Have Questions?

Call our seasoned sales team on 01889 597281.

Send us a message through our Contact Form.

Email your cutting list to .

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