Roof Razor Insulation Spacer

1/2

$97.99

$97.99 $103.15

GST inclusive

Dispatch: Most orders are processed the same day. Metro delivery: Usually 1–3 business days. We do our best to get most items out on the next business day.

Australia-wide freight · Local pickup from Epping, VIC by arrangement. Ordering from the outback? Get in touch about deliveries to remote locations · 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, and comes pre-loaded with its fasteners.

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, the 85 mm suits 100 to 120 mm blanket, and the 115 mm is for thicker build-ups. Six pieces per pack gives 7.2 lineal metres.

Before you order

Check the purlin. The standard spacer needs a minimum 1.2 BMT purlin with a full 50 mm flat surface, because a narrower flange will not take the fixing pattern. Standard version covers wind regions A and B, and a cyclonic version is made for regions C and D. If you are fixing to timber battens, order the version without pre-loaded screws.

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)

Fletcher Insulation · Galvanised steel spacer · Metal roof thermal break application

Sizes stocked

Spacer height	Length	Pieces per pack	Lineal metres per pack	Suits blanket	Product code
60 mm	1200 mm	6	7.2 m	75 to 80 mm	396299
85 mm	1200 mm	6	7.2 m	100 to 120 mm	396291
115 mm	1200 mm	6	7.2 m	Thicker blanket build-ups	396292

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
Pre-loaded fasteners	6 x 12g 14TPI Class 4 (standard version)
Wind regions	A and B (standard version). Cyclonic version covers C and D
Minimum purlin thickness	1.2 BMT
Minimum purlin surface	50 mm flat
Fastener centres	38 mm
Dead load capacity	205 kg between legs, irrespective of span
Weight	2 kg per spacer
Roof sheet fastener yield capacity	0.583 kN per 12g 14TPI screw, screws not supplied

Figures above are for the standard spacer. A cyclonic version is made for wind regions C and D with 14g 10TPI Class 4 fasteners and a 1.5 BMT minimum purlin.

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

Screw the spacer down onto the purlin through the pre-loaded fasteners, run the blanket over the top, then fix the roof sheet to the spacer. Check that the purlin gives you a full 50 mm flat surface before you start, because a narrower flange will not take the fixing pattern. Pick the height from the blanket you are using, not from the roof pitch: 60 mm for 75 to 80 mm blanket and 85 mm for 100 to 120 mm blanket. If you are fixing to timber battens, order the version without pre-loaded screws and use screws long enough for the batten plus the penetration depth your timber needs.

Figures are taken from the Fletcher Insulation technical data sheet for Roof Razor. The full manufacturer document is linked above. Fletcher can change specifications without notice, so check the current sheet before specifying on a job.