Thermowood Tongue and Groove Cladding

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

Photo: T&G Thermowood

Thermowood Tongue and Groove timber cladding

Work out a Price Below

Please note that iWood is a wholesale timber merchant, and to maintain such competitive prices, we have a minimum order amount of £750.00 ex VAT for delivery (£350.00 ex VAT for collection).

1) Click to choose a Tongue and Groove Cladding profile

IWC1 T&G 145mm (135 face) x 19mm
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IWC1 T&G 145mm (135 face) x 19mm
IWC2 T&G 95mm (88 face) x 19mm
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IWC2 T&G 95mm (88 face) x 19mm
IWC3 T&G 142mm (125 face) x 19mm
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IWC3 T&G 142mm (125 face) x 19mm
IWC4 T&G 145mm (125 face) x 19mm
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IWC4 T&G 145mm (125 face) x 19mm
IWC5 T&G 145mm (125 face) x 19mm
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IWC5 T&G 145mm (125 face) x 19mm

2) Click to choose a grade of Thermowood

Select Sawfalling Cladding
Sawfalling
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?

 
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Related Products

Product Description
Fitting Guidance
Treatment

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.

Example Pricing for Thermowood Tongue and Groove Cladding - Boards in Stock Machined to Order
Price From £2.89 ex VAT per meter (Profile: IWC2 T&G 95mm (88 face) x 19mm - Grade: Sawfalling - 1m)
What do our Customers Say?
Good communication and website. Easy to use and understand. Many thanks.
- Chris Waterhouse

Hello iWood Team, Please find attached some pics of the workshop that I built last year using your Western Red Cedar. I am very pleased with the outcome, what an amazing material to work with. Hope that the pics are suitable for your needs.
- Bob Beckett

The ordering process is very good, and helpfull advice given over the phone.
- David Hudson

Stanbrook & Nicholson Ltd have been buying European Oak from iWood since their inception. In our trade it is often difficult to get both service and product quality from our suppliers. iWood have consistently provided us with an absolute first rate product with service to match. A high proportion of our timber purchased comes as cut to size putting our wastage at nearly zero per cent. This also speeds our process of manufacture.
- Ben Stanbrook and Simon Nicholson

Very detailed website for ordering my exact requirements easily.
- Richard Boundy

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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 10 to 14 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.

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 597 281.

Send us a message through our Contact Form.

Email your cutting list to enquiries@iwood.co.uk.

To get a price, you can type in how many square metres of cladding you need. It's very easy to work out.

We're going to work out the total area of one side of a building, then subtract the windows and doors, then add 10% extra for wastage.

1) For each wall that you’re cladding, measure the full width and the height in metres to work out the total area.

In this (expertly designed) example, the frontage is 9 metres wide and 4.7 metres high. 9 x 4.7 gives a total 42.3 square metres.

How to measure For Cladding Step 1

Total area of frontage = 9 * 4.7 = 42.3 square metres

2) Work out the area of the doors and windows

In this house front there are four windows and a door. Measure the width and height of each window and door, then add the areas together:

How to measure For Cladding Step 2

  • Window 1: 1.9 x 1.2m = 2.28 square metres
  • Window 2: 1.2 x 1.2m = 1.44 square metres
  • Window 3: 1.2 x 1.2m = 1.44 square metres
  • Window 4: 1.9 x 1.2m = 2.28 square metres
  • Door: 1.0m x 2.0m = 2.00 square metres

Total area of windows and doors = 9.44 square metres

3) Subtract the area of the doors and windows from the total area of the wall.

We now have our total area (42.3 square metres) and the total area of the doors and the windows (9.44 square metres). Because we don't want cladding to cover the windows and door, we take the door and window area away from the total area.

Total area to clad = 42.3 – 9.44 = 32.86 square metres to clad

4) Add at least 10% spare for wastage

We recommend ordering at LEAST 10% more cladding than you've measured for to account for the required cutting and shaping.

32.86 square metres + 10% = 36.146 square metres. In this case, we'd round it up to 37 square metres.

Total to order = 37 square metres

Do the same for any other sides of the building, add them together and you'll have your grand total.

When working with set lengths it is important to take into account any waste.

This is easy enough if you can select the exact length you need, however, that isn’t always the case which is where you need to take a bit more care when ordering. If you can select the length you want, our website will automatically work out the number of pieces required, otherwise you will have to work out the additional quantity.

So for example, if you are cladding a wall that is 2.3m high and 6m wide (as seen in the below image) with vertical cladding, you may want set lengths so that you have no vertical joins.

Set length Example Wall

To work out your coverage you will need to do the quick calculation to work out your area:

Square Metre Calc

Height x Width = Square Metres
2.3 x 6 = 13.8m2

Once we have this we can work out your linear meters (Our website will let you enter either square or lineal metres as a quantity and will automatically work out the other for you).

The linear metres required depends on the profile, so for this example we are using IWC1 which has a 135mm face.

Linear Metre Calc

Square Metres / Face (in metres) = Linear Metres
13.8 / 0.135 = 102.22

Set length Example Quantity

This is where we need to work out what quantity you actually need. For a 2.3m length in this example, the closest set length is 2.44m so to get a price the iWood website will do the following calculation.

Number of Pieces Calc

Linear Metres / Length of Pieces (Rounded to next highest number) = Number of Pieces
102.22 / 2.44 = 41.89 – Rounded to 42

Now to work out the actual number of pieces we need, we need to change that calculation to this:

Linear Metres / Length Wanted = Actual Number of Pieces required
102.22 / 2.3 = 44.44 – Rounded to 45

So, with the first calculation we would have been 3 pieces short.

So now we need to work out the actual number of lineal metres we need in order to not be short on order. So now we need to rework out our quantity.

Number of pieces needed * Length of Pieces = Actual Quantity
45 * 2.44 = 109.8

Enter the new Actual Quantity into the linear metres and you will get the correct price.

We do recommend adding 10% waste on all cladding orders just to account for any cutting that needs to be done on site.

Wastage Calc

Qty (either square metres or linear metres) * 1.1 = total with 10% waste.