SureFast product selector

The SureFast tube and fastener range are designed to fasten insulation up to 300mm thick to any standard flat roofing deck substrate. On this page we show a typical flat roofing application, explain how to work out the correct length tube washer and fastener you need. We also provide a quick reference table which shows the type and length of fastener you need to suit specific thicknesses of insulation.

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How to select the correct tube and fastener

To optimise the benefits of the tube fastener system, the ideal combination is the use the maximum tube washer length, and the minimum fastener length available. This both eliminates heat loss through the metal fastener, and is more cost-effective as long length fasteners tend to cost more than long length tube washers

 

First, work out the tube length. To select the tube length, deduct 20mm from the total roof build-up, which allows for insulation compression, and choose the tube of that length or shorter.

 

Next, the fastener length. Take the total roof build-up, and deduct the length of the selected tube fasteners. Then, add the deck penetration/embedment length (see table further down this page), and then add 25mm for to allow for the length of fastener in the tube. Then select the fastener of this length or longer.

Example - fixing 120mm insulation to 0.7mm steel deck

Tube Calculation  
Insulation thickness 120mm
-20mm (to allow for insulation compression) 100mm
Maximum tube length 100mm
Use tube washer: SF-T-75 x 100

 

Fastener calculation  
Insulation thickness 120mm
-100mm (tube length) 20mm
+15mm (penetration through steel deck 35mm
+25mm (amount of fastener in tube washer) 60mm
Minimum fastener length 60mm
Use fastener SF-RS-SSA4-4.8 x 60

Penetration/Embedment depths for standard deck substrate types  

 

Application Penetration / Embedment
Steel decking 15mm through underside
Plywood 18mm minimum thickness, 12mm through the underside
Timber decking 25mm minimum thickness, 12mm through the underside
Timber joists 35mm embedment
Structural Concrete 25mm embedment

 

SureFast selector chart

 

    Steel Deck Concrete Deck 18mm plywood or OSB
Insulation thickness (mm) Tube Length (mm) Drive Bar Length (mm) SF-RS-4.8 SF-RS-SSA4-4.8 SF-RS-5.8 SF-RS-6.1 SF-RS-5.8 SF-RS-SSA4-4.8
40 25 50 60 60 55 75 75 80
50 25 50 80 80 65 75 85 80
60 25 50 80 80 75 85 95 100
70 50 150 60 60 65 75 75 80
80 50 150 80 80 75 85 85 100
90 75 150 60 60 55 75 75 80
100 75 150 80 80 65 75 85 80
110 75 150 80 80 75 85 95 100
120 100 150 60 60 65 75 75 80
130 100 150 80 80 75 85 85 100
140 125 200 60 60 55 75 75 80
150 125 200 80 80 65 75 85 80
160 125 200 80 80 75 85 95 100
170 150 200 60 60 65 75 75 80
180 150 200 80 80 75 85 85 100
190 175 300 60 60 55 75 75 80
200 175 300 80 80 65 75 85 80
210 175 300 80 80 75 85 95 100
220 200 300 60 60 65 75 75 80
230 200 300 80 80 75 85 85 100
240 225 300 60 60 55 75 75 80
250 225 300 80 80 65 75 85 80
260 225 300 80 80 75 85 95 100
270 250 300 60 60 65 75 75 80
280 250 300 80 80 75 85 85 100
290 250 300 80 80 85 100 95 100
300 250 300 100 100 95 100 105 120