Roof Razor® Insulation Spacer
Standard, pre-loaded screws / 115mm (6pk, 1200mm)
$132.00
Sale price
$132.00
Regular price
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Roof Razor® Insulation Spacer
$132.00
Sale price
$132.00
Regular price
GST inclusive
Opening Offer: 5% off orders over $1,000, 7% over $2,500, 10% over $4,000. Ends 30 November. Offer details
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Delivery to VIC and NSW: $55 in metro Melbourne and metro Sydney, $99 in the outer ring around both cities, $149 anywhere else in the two states · Local pickup from Epping, VIC by arrangement · Shipping details
Roof Razor is a galvanised steel spacer that sits on the purlin and holds the roof sheet clear of it, so the blanket underneath keeps its full thickness right across the support. It is 1200 mm long, which matches a standard blanket width. Fletcher makes it in four versions.
Which version
- Standard, pre-loaded screws. For metal purlins in wind regions A and B, with six 12g 14TPI Class 4 screws already fitted. 60, 85 or 115 mm.
- Standard, without pre-loaded screws. The version for timber battens, in 85 or 115 mm. Fletcher recommends screws 62 mm long plus the penetration depth for the 85 mm, and 92 mm plus the penetration depth for the 115 mm.
- Cyclonic, pre-loaded screws. For wind regions C and D. It carries an extra steel batten insert and comes with six 14g 10TPI Class 4 screws fitted. 60, 85 or 115 mm.
- Metal roof cyclonic, without pre-loaded screws. 115 mm only.
Why a spacer changes the numbers
Insulation crushed flat at the purlin is where most of the heat crosses a metal roof. A blanket rated at R2.5 that gets squeezed to nothing every 1200 mm is not delivering R2.5 across the roof, and no amount of extra thickness fixes that on its own. The spacer keeps the blanket at full loft over the support, which is the whole point of specifying one. Roofing blanket R-values explains the gap between the number on the roll and the number the roof achieves.
Picking the height
Choose from the blanket you are using, not from the roof pitch. The 60 mm spacer suits 75 to 80 mm blanket and the 85 mm suits 100 to 120 mm. For 130 to 145 mm blanket, use the 115 mm. Six pieces per pack gives 7.2 lineal metres.
Before you order
Check the purlin and the pitch. The standard spacer needs a minimum 1.2 BMT purlin and the cyclonic one 1.5 BMT, both with a full 50 mm flat surface, because a narrower flange will not take the fixing pattern. Fletcher rates Roof Razor for roof pitches up to and including 30 degrees. It is designed for metal purlins. On timber battens or trusses, Fletcher asks for a structural engineer at design stage.
Dead load capacity is 205 kg between the legs regardless of span, and the spacer is steel, so it adds no fuel load. Full structural figures are in the table below, and Metal roof insulation in Australia shows where the spacer sits in the layer order.
Technical data
Fletcher technical data sheet (PDF)Sizes stocked
| Version | Spacer height | Suits blanket | Product code |
|---|---|---|---|
| Standard, pre-loaded screws | 60 mm | 75 to 80 mm | 4006606 |
| Standard, pre-loaded screws | 85 mm | 100 to 120 mm | 4006601 |
| Standard, pre-loaded screws | 115 mm | 130 to 145 mm | 4006602 |
| Standard, without pre-loaded screws (timber battens) | 85 mm | 100 to 120 mm | 4006604 |
| Standard, without pre-loaded screws (timber battens) | 115 mm | 130 to 145 mm | 4006605 |
| Cyclonic, pre-loaded screws | 60 mm | 75 to 80 mm | 4006607 |
| Cyclonic, pre-loaded screws | 85 mm | 100 to 120 mm | 4005301 |
| Cyclonic, pre-loaded screws | 115 mm | 130 to 145 mm | 4006603 |
| Metal roof cyclonic, without pre-loaded screws | 115 mm | 130 to 145 mm | 4005302 |
Every pack holds 6 spacers, each 1200 mm long, which is 7.2 lineal metres.
What it does
| Purpose | Holds the roof sheet clear of the purlin so the blanket keeps its full thickness over the support |
|---|---|
| Why it matters | Insulation crushed at the purlin is where most of the heat crosses a metal roof |
| Cover | 1200 mm |
Structural
| Batten material | 1.15 BMT G550 Z275 steel |
|---|---|
| Cyclonic insert | Extra 1.15 BMT G550 Z275 batten insert, cyclonic versions only |
| Pre-loaded fasteners | Standard: 6 x 12g 14TPI Class 4. Cyclonic: 6 x 14g 10TPI Class 4 |
| Wind regions | Standard: A and B. Cyclonic: C and D |
| Minimum purlin thickness | Standard: 1.2 BMT. Cyclonic: 1.5 BMT |
| Minimum purlin surface | 50 mm flat |
| Fastener centres | 38 mm |
| Dead load capacity | 205 kg between legs, irrespective of span |
| Weight | Standard: 2 kg per spacer. Cyclonic: 3 kg per spacer |
| Roof sheet fastener yield capacity | Standard: 0.583 kN per 12g 14TPI screw. Cyclonic: 1.43 kN per 14g 10TPI screw. Roof sheet screws not supplied |
Roof Razor Cyclonic is Low-High-Low (LHL) tested in accordance with NCC Volume 1 Specification B1.2.
Fire
| Material | Steel, non-combustible |
|---|
The spacer itself does not add fuel load. Fire performance of the roof comes from the blanket and the sheet.
Fitting notes
Safety mesh and blanket go down first. Roof Razor then goes on over the purlin and, on the pre-loaded versions, is screwed down through its six fasteners, cutting through the blanket so it bears directly on the purlin. Fix the roof sheet to the spacer last. Sheet screws are not supplied. Before you start, check the purlin maker's dimensions for a full 50 mm flat surface, and check the pitch: Fletcher rates Roof Razor for roofs up to and including 30 degrees. Height comes from the blanket, not the pitch: 60 mm for 75 to 80 mm blanket, 85 mm for 100 to 120 mm and 115 mm for 130 to 145 mm. For timber battens there is a version without pre-loaded screws, in 85 and 115 mm. Fletcher recommends screws 62 mm long plus the penetration depth for the 85 mm, or 92 mm plus the penetration depth for the 115 mm, and asks for a structural engineer at design stage on any timber batten or truss job.
Figures are taken from the Fletcher Insulation technical data sheet for Roof Razor, revision 8, issued 5 July 2022, which is linked above. Product codes are the current ones from Fletcher's product page, checked 14 October 2026; the 2022 sheet still shows the earlier 396 codes. Fletcher can change specifications without notice, so check the current sheet before specifying on a job.
Common questions
What sizes are stocked and how much does each one cover?
9 options are stocked, running from Standard, pre-loaded screws to Metal roof cyclonic, without pre-loaded screws. The table above lists each one with the coverage or quantity you get.
What is it made of?
Batten material: 1.15 BMT G550 Z275 steel. Material: Steel, non-combustible.
How is it installed?
Safety mesh and blanket go down first. Roof Razor then goes on over the purlin and, on the pre-loaded versions, is screwed down through its six fasteners, cutting through the blanket so it bears directly on the purlin. Fix the roof sheet to the spacer last. Sheet screws are not supplied. Before you start, check the purlin maker's dimensions for a full 50 mm flat surface, and check the pitch: Fletcher rates Roof Razor for roofs up to and including 30 degrees. Height comes from the blanket, not the pitch: 60 mm for 75 to 80 mm blanket, 85 mm for 100 to 120 mm and 115 mm for 130 to 145 mm. For timber battens there is a version without pre-loaded screws, in 85 and 115 mm. Fletcher recommends screws 62 mm long plus the penetration depth for the 85 mm, or 92 mm plus the penetration depth for the 115 mm, and asks for a structural engineer at design stage on any timber batten or truss job.
Cannot see your question? Ask our team and we will get you an answer.
Figures are taken from the Fletcher Insulation technical data sheet for Roof Razor, revision 8, issued 5 July 2022, which is linked above. Product codes are the current ones from Fletcher's product page, checked 14 October 2026; the 2022 sheet still shows the earlier 396 codes. Fletcher can change specifications without notice, so check the current sheet before specifying on a job.
