Self-Drilling Roof Screws for Fibreglass Sheeting
Fixing fibreglass roofing calls for more than a standard roofing screw. Bremick Fibreglass Screws are purpose-designed self-drilling roof fasteners for securing compatible fibreglass roof sheeting to steel purlins, combining drilling, sheet fixing & weather sealing in one fastening system.
Working with corrugated, square-rib or broad-sheet fibreglass roofing? Bremick's Fibreglass SDM system suits profiles with 16–35 mm rib heights over compatible steel purlins up to 2.4 mm thick. Available 12g-14 x 50 mm & 12g-14 x 65 mm options give installers a choice of length for different roofing setups.
The advantage is a fixing designed around the material. Cutting fins create the required expansion hole through the fibreglass before the self-drilling point continues into the steel, while the weather-seal washer is designed to seal the completed fixing when correctly installed.
For other drilling fasteners used across roofing & construction work, compare Self-Drilling Screws.
What Are Bremick Fibreglass Screws?
Unlike a general-purpose metal screw, a fibreglass roofing screw needs to work with both the roof sheet & the steel supporting it.
Bremick Fibreglass Screws are 12g-14 self-drilling roofing fasteners designed for fastening the crests of compatible fibreglass roof sheeting to steel purlins. The screw passes through the sheet, drills into the supporting steel & secures the roofing while the washer provides the sealing interface around the fixing point.
A key feature is the cutting-fin design. As installation begins, the fins create an expansion hole through the fibreglass. Once the fastener reaches the steel purlin, the fins are designed to break away so the self-drilling point can continue into the steel.
That controlled process matters because fibreglass roofing shouldn't simply be treated like conventional steel sheet.
Bremick's published Fibreglass SDM range includes:
► 12g-14 x 50 mm with Weather Seal
► 12g-14 x 65 mm with Weather Seal
► 5/16 hex driver
► 32 mm diameter Weather Seal
► Cutting fins
► Self-drilling point
► Armour Coat™ Class 4 protection
► Options for corrugated & ribbed fibreglass roofing
Completing a roofing order? Roofing Nails & Fasteners covers additional fixing requirements that can arise elsewhere on the job.
Why Choose Bremick Fibreglass Screws?
What makes a dedicated fibreglass screw preferable to simply reaching for another roofing fastener?
The difference is how the fastener handles the sheet. Fibreglass requires a fixing that can create an appropriate opening, engage the supporting steel & allow the weather-seal washer to seat correctly without unnecessary stress around the fixing point.
Bremick's design addresses those requirements in a single self-drilling fastener.
► Cutting fins create an expansion hole through the fibreglass
► Self-drilling point continues into compatible steel purlins
► Weather Seal provides sealing around the completed fixing
► 12g-14 thread provides a purpose-designed roofing fastening format
► 50 mm & 65 mm lengths provide options for different roof profiles
► Class 4 coating provides corrosion protection within Bremick's specified application
Across larger roofing jobs, consistency becomes another advantage. Using the correct fastener & installation method helps crews repeat the same fixing approach across multiple sheets rather than improvising from one fastening point to the next.
Where junctions, penetrations or repairs also need sealing, Roof Sealants & Adhesives can help complete the roof installation.
Common Applications
Picture a workshop or shed roof where translucent fibreglass sheets are installed alongside conventional roofing. The fibreglass still needs to be secured to the structure, but its fixing requirements differ from those of ordinary metal sheeting.
That's where a dedicated fibreglass roofing fastener earns its place.
Bremick Fibreglass Screws suit correctly specified applications including:
► Corrugated fibreglass roof sheeting
► Square-rib fibreglass roofing
► Broad-sheet fibreglass roofing
► Translucent roof sheeting
► Industrial sheds
► Agricultural sheds
► Workshops
► Warehouses
► Farm structures
► Commercial buildings
► Roof-light installations
► Replacement roof sheets
► Roofing repairs & maintenance
Exposure to wind & rain means the surrounding roof system matters as well. Existing seals, penetrations, adjoining materials & the condition of older roofing should be checked while repair or replacement work is being planned.
For related products used around exposed roof areas, browse Weatherproofing Supplies.
Product Selection Guide
First, Confirm You're Fixing Fibreglass
Similar-looking translucent roof sheets aren't necessarily made from the same material.
Fibreglass, polycarbonate & other roofing products can have different fastening requirements. Confirm the actual sheet material before choosing screws rather than relying on appearance alone.
For a practical look at why correct fastener selection matters, read Why Good Fasteners Matter More Than the Tool You Drive Them With.
Check the Roof Profile & Rib Height
A quick measurement can prevent the wrong fastener being ordered.
Bremick specifies its Fibreglass SDM system for compatible roofing profiles with 16–35 mm rib heights. Measure the actual profile rather than assuming two visually similar sheets have identical dimensions.
Look at the Steel Underneath
The structure below the roof sheet is just as important as the sheet itself.
Bremick specifies the Fibreglass SDM system for compatible steel purlins up to 2.4 mm thick. If the supporting material or thickness falls outside the intended application, confirm the appropriate fastening method before installation.
Choose Between 50 mm & 65 mm
Length should be selected around the complete roofing assembly rather than choosing the longest screw by default.
Bremick identifies 12g-14 x 50 mm & 12g-14 x 65 mm Fibreglass Self Drilling for Metal options. Consider the roof profile, rib height, required grip & supporting steel when determining which available length suits the job.
Replacing old roofing screws? Check the actual assembly rather than assuming the existing fastener was correctly specified.
Understand the Expansion Hole
Here's one detail that's easy to overlook.
The cutting fins on the Bremick Fibreglass SDM are designed to create an expansion hole through the fibreglass sheet before the screw engages the steel purlin.
That feature is one of the practical differences between a purpose-designed fibreglass fastener & an ordinary self-drilling screw.
Use a Controlled Driver
Fast installation isn't the same as uncontrolled installation.
Bremick's installation guidance calls for controlled drilling through the fibreglass so the expansion hole can form before the fastener continues into the supporting steel. Keep the driver aligned & watch the washer as the screw reaches its final position.
For other equipment needed to prepare & complete roofing work, browse Roofing Tools & Accessories.
Plan Safe Access Before Work Starts
Roofing fasteners are only useful if the work area can be reached safely.
Access requirements depend on the building, roof height & work being performed. Where suitable access equipment is required, browse Roof Access Equipment before the job begins.
Expert Tips
Keep the driver square to the fixing point. Better alignment helps the screw enter cleanly & allows the washer to seat more evenly against the roof sheet.
Give the cutting fins time to work. They're designed to form an expansion hole through the fibreglass before the fastener continues into the supporting steel.
Watch the washer as the screw finishes. The aim is a firmly seated weather seal, not maximum possible compression.
Avoid over-driving. Excessive tightening can deform the washer or affect the way it seals against the sheet.
Check the first few fixings before continuing across the roof. Look for consistent alignment, clean installation & correct washer seating before repeating the process across multiple sheets.
Use the correct driver. Bremick specifies a 5/16 hex driver for its published Fibreglass SDM fasteners.
Consider exposure before choosing fasteners. Bremick identifies Armour Coat™ Class 4 protection for the Fibreglass SDM range, but the selected fastener still needs to suit the actual project environment & specification.
Treat working at height as part of the job plan. Where the work requires fall-protection equipment, browse Safety Harnesses & Fall Protection for relevant equipment.
Want more practical fastening guidance? Fastener Guide Bolts Screws Anchors covers common fastening choices while Spring Jobsite Prep Getting Your Gear Ready looks at preparing equipment before busy site work.
