Thermowood Rainshield Cladding

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

Photo: Samples of Thermowood

Thermowood Rainshield 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 Rainshield Cladding profile

IWC8 Rainshield 142mm (138 face) x 19mm
IWC8 Rainshield 142mm (138 face) x 19mm

2) Click to choose a grade of Thermowood

Select Sawfalling Cladding
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 Rainshield Cladding do you need?

Get Price

Related Products

Product Description
Fitting Guidance

Thermowood Rainshield Cladding

Thermowood Rainshield

Thermowood Rainshield cladding is a contemporary product which combines machined smoothness with traditional feather edge overlapping. Although it isn’t overlapped quite as much as what feather edge is, the Rainshield profile we supply has the overlap built into it with the chamfer on both faces for the top and bottom of the board. This design is to help water run of the face of the timber naturally while allowing air to circulate behind (which is always helped by a breathable membrane as well).

The Thermowood iWood supplies is a Scandanavian Pine which has been heat treated so that the most amount of moisture as possible has been removed from the timber. This improves durability and stability. The third benefit of this treatment is that is dries up any resin and tannin in the wood so helps to prevent it from rotting. Due to this process the characteristics of the wood are changes so that it struggles to take on moisture, this makes it ideal for external use, and means you don’t need to seal it with a paint or oil.

If you do wish to paint the timber or preserve the colour, you can get a wide range of treatments at wood finishes direct. Thermowood will take the paint well, so you will get the finish you desire.

We provide Thermowood Rainscreen cladding in our IWC8 profile in a Sawfalling grade. This grade of wood does contain a fair number of knots, most of which will be sound. It is worth accounting for the dead knots that may appear in the timber though, so we recommend ordering an extra 10% so you can cut around these knots.

A Suitable Alternative to Siberian Larch

With current supplies of Siberian Larch being difficult int eh current climate, we have been looking for a suitable wood to fill the void and Thermowood fits the bill perfectly. It is highly durable with little maintenance and take s a paint really well. Making it a solid choice for any cladding project you have.

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

Example Pricing for Thermowood Rainshield Cladding - Boards in Stock Machined to Order
Price From £6.46 ex VAT per meter (Profile: IWC8 Rainshield 142mm (138 face) x 19mm - Grade: Sawfalling - 1m)
What do our Customers Say?
Well priced and easy to order.
- Alan Rumbles

I'm very happy with the customer service here and will be definitely using iWood again in the future.
- James Marshall

Having just had a delivery of Siberian Larch cladding for my garage, I have to leave a review. From the fantastic website, through the simple ordering peocess, the excellent written and verbal communication to the great quality of the product itself, I have nothing but praise for this company. I will DEFINITELY buy again for my extension and will recommend to anyone that needs feature timber.
- Lee Green

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

It was so easy.
- Shkumbin Sufa

Like what you see?
Architect / Design Specify

Product Code: IW-18-64-21-4

Specify: Sawfalling Thermowood External Cladding Rainshield Cladding from iWood Timber

Some commonly asked questions


Our timber is imported straight from sawmills on the continent. Our usual lead times are therefore 10 to 14 working days.


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.


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.


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.


Yes you can, you can order samples of certain timbers at 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

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.