Firrings (tapered wedges)Price Calculator

Firrings (tapered wedges)Price Calculator

We cut our firrings (tapered wedges) from timbers to your bespoke sizes. They are mainly used to form a slope or taper on flat roofs to make sure the rain water runs off. They can be used to level floors or ceilings. They are fastened, using nails, to the top of existing joists and then sheeted over. See the diagram below which illustrates the general shape of a firring. We stock an off the shelf firring that may work out cheaper.

As a guide for deciding on firring height a minimum gradient of 1:80 is usually required. Anything steeper that 1:80 could be a waste. Using the drop down menus below please choose from our standard heights and gradients or enter your own. This site is easier to use on a desktop computer than on tablets or phones. You can collect your firrings or have them delivered. For help using this calculator please ring 01623553797 during working hours. If you require firrings greater than 9.6m or firrings beyond the scope of this calculator please contact us for a price.

Enter your requirements

Enter your requirements

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Quantity of firrings: 

Length in millimetres: 

     Supply in Half Lengths? (No) 
info! Half Lengths

This button gives the option of having the firrings in two half lengths. This can make transport easier and cheaper.
The price of the firrings maybe be cheaper if having an odd number. Otherwise the firring cost could increase.

NOTE:Each firring will be in one full length of 3000mm.

Timber thickness:  

Fall Option:  
Which gives a gradient of 1:97.

Timber treatment:
NOTE:This size is available in untreated and semi-treated. The former is cheaper.

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Firrings will be added to a green basket table below.

Specification and price

Specification and price

Firring Description Quantity Firring
Thickness Fall Gradient Weight Firrings
1 firrings. Fall of
36mm to 5mm over
3000mm x 44mm thick.
Supplied in 3000mm
lengths. untreated.
1 pieces
3000mm 44mm 36mm to 5mm
(Note: These
sizes are not exact
and are
usually to within 2mm.)
1:97 1.38 kg £37.99
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Delivery address

Delivery address

Please give us your delivery address so we can give a delivery price. If you are paying via paypal, using your paypal account or credit card, we can only deliver to an address which is registered on your paypal account. If your delivery address isn't already registered on your paypal account you will need to login to your paypal account and enter a new registered address. You can do this by clicking your 'Profile' and selecting 'Profile and settings'. Alternatively, you can pay by direct bank transfer using your online bank account. Using this method we can deliver to any address.

Enter your postcode and click 'Find Address'
to look up your address. The boxs to the right will be populated automatically:
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Calculator Help and Information

Calculator Help and Information

Length of firring

The maximum stock length we have is 5.4m from which we can achieve a firring length of 10.8m by folding one half over the other. See diagram below. If you need longer please give us a ring or email in.

Timber Thickness

There are two timber thicknesses to choose from, 44mm and 69mm. 44mm is the most common. We have a far greater range of timbers in 44mm. There is no structural reason why 69mm should ever be used for a flat roof but we have included it anyway in case matching up to 69mm joists is desired. Delivery will cost more for the 69mm due to increased weight.

Timber Treatment

Treatment of firrings is not needed for flat roofs but we have included it just in case it has been insisted upon. Treatment is only available in the 44mm thickness. WARNING: treatment will be cut away from the tapered edge and maybe from the bottom edge as well.

Different cutting techniques

Photo of treated firring