Fixings Calculator

Quick, Easy Ordering Process 

For quick and easy ordering use our warm deck fixings calculator designed to ensure you have the correct fixings for your flat roof, whether it is a timber, steel or concrete deck.

1. Select your method of waterproofing - (Mechanically Fixed / Fully Adhered)
2. Select your deck type - (Timber/Steel/Concrete)
3. Input the thickness of your insulation board
4. Input the thickness of any layers above the insulation if applicable - (Such as timber which is often installed above the insulation to allow for water based adhesion of a single ply membrane)

5. Add to Basket - (Our fixings will add to your basket as a box of 100 tubes and a box of 100 screws. Please increase the quantity as per your roof size - Guide below on quantity per board.)

This will then add the correct tube and screw combination required to secure your insulation to the lower deck. It really is that easy! Our fixings will add to your basket as a box of 100 tubes and a box of 100 screws. Please increase the quantity as per your roof size.

Note: Please contact us if your roof is any different to these parameters. 
Note: These can only be used on flat roofs. Contact us for other fixings for pitched roofs or walls.

Method of Waterproofing Application

Mechanically Fixed System

A mechanically fixed waterproofing system for a flat roof involves securing a single ply roof covering to the roof structure using mechanical fastening such as screws and plates. The membrane is then overlapped over the secured fasteners and sealed using heat welding or adhesives tto create a waterproof seal. 

Examples of mechanically fixed systems include PVC, TPO and some EPDM membranes.

Fully Adhered System

A fully adhered waterproofing system for a flat roof involces securing the roof covering directly to the deck with adhesives or liquids.

Examples of fully adhered systems include Felt, EPDM rubber roofing, GRP fibreglass roofing and liquid roofing systems.
 

Deck type

Timber Deck

A timber deck must be an 18mm or thicker OSB / Plywood or similar base as this is the minimum timber deck thickness for structural requirements. 

The tube and screw combination will protrude through a timber lower deck by approximately 20-30mm as required for the correct pull out performance. These are not designed to go into the joists.
 

Steel Deck

A steel deck must be between 0.7mm and 1.2mm thick.

The tube and screw combination will protrude through the steel lower deck by approximately 20-30mm as required for the correct pull out performance.
 

Concrete Deck

A concrete deck must have a minimum fixing embedment of at least 40mm.If you have aerated concrete a different screw will be needed. Please contact us for this type of deck.

How many fixings do I need for my insulation?

Our fixings will add to your basket as a box of 100 tubes and a box of 100 screws. Please increase the quantity as per your roof size.

For a 2400mm x 1200mm board, we recommend 12 fixings per board. If your project is exposed or is in a high wind area this should be increased to 16.

For a 2400mm x 600mm T+G board, we recommend 8 fixings per board.

For a 1200mm x 1200mm board, we recommend 9 fixings per board.

Which P2 Drive bit should I use with the HTK 2G Tubes?

15mm HTK 2G & 35mm HTK 2G Tube use P2 50mm
55mm HTK 2G Tube use P2 110mm
95mm HTK 2G Tube use P2 150mm
145mm HTK 2G & 185mm HTK 2G Tube use P2 200mm
225mm HTK 2G Tube use P2 250mm
275mm HTK 2G Tube use EJOT M6 Bar with P2 M6 Bit
325mm HTK 2G Tubeuse EJOT M6 Bar with P2 M6 Bit