Timber Firrings Price Calculator. sales@roncurrie.co.uk    Tel: 01623 553797

Firrings Price Calculator

We cut our firrings from timbers to your bespoke sizes. Their purpose is to form a slope or taper on flat roofs to make sure the rain water runs off. 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. Using the drop down menus below please choose from our standard heights and gradients or enter your own heights and gradient. You can collect your firrings or have them delivered. The maximum firring length we can provide for collection is 12m. We are restricted to 11.4m firring length if we are delivering. For help on how to use this calculator go to the bottom of the page.

Enter your requirements

Please press 'enter' after filling each box otherwise it won't update.

Quantity of firrings: 

Length(mm):      Supply in Half Lengths? (No) 
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.
info! Each firring will be in one full length of 3000mm.

Timber thickness:  

Timber treatment:  

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

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Pricing table

Firring Description Quantity Firring
Thickness Fall Gradient Weight Firrings
1 firrings. Fall of
36mm to 5mm over
3000mm x 44mm thick.
Supplied in 3000
lengths. untreated.
1 pieces
3000mm 44mm 36mm to 5mm
(Note: These
sizes are not exact
and are
usually to within 2mm.)
1:97 1 kg £17.03
Add firrings to basket

This option is for recalling previous quotations.
Copy and paste your reference here and press "enter".
Basket Reference(Optional):
Basket Reference

You can re-enter this reference at any point in the future to recall your basket. On entering your reference you must press enter.


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.:
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Enter Your Telephone number (We can't deliver without it) :

Choose delivery option : Total price : £

PayPal with credit card option : Buy Now

Bank transfer: Our bank details are sort-code: 205562, account-number: 63732932.

Calculator Help and Information

Quantity of firrings

When we cut firrings from our stock timbers we get 2 firrings per piece. If you order an odd number we will charge you for the next even number up. If delivery is needed then it would be cheaper to order exactly what you need as delivery cost is based on weight. The spare firring would be discarded in this case.

Length of firring

We will cut to length but we will charge for the nearest stock length. Our stock lengths are 2.4m, 3.0m, 3.6m, 4.8m and 6.0m which may vary depending on what section you require. Firrings less than 4.8m they will be supplied one piece. Firrings greater than 4.8m will be supplied in two halves.

Timber Thickness

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.

Fall Option

When choosing your "Fall option" below please note we have a far greater range of timber sizes to use in the 44mm thick firring option which could result in less waste and cost.