Roofing Screws
Roofing screws fix metal sheets fast and hold them tight against wind, rain, and movement, with sealing washers that stop leaks where it matters.
If you're fixing box profile sheets, cladding, or light roofing to steel or timber, get the right roofing screws from the start or you'll be back chasing leaks and loose sheets. Self drilling roofing screws save time on steel, while galvanised roofing screws with washer setups help keep weather out and the fixing point sound. You will find Screws here for proper site work, from tek screws for steel to metal roofing screws sized for solid bite and clean pull-down.
What Are Roofing Screws Used For?
- Fixing box profile roofing sheets to steel purlins is where self drilling roofing screws earn their keep, cutting in cleanly and pulling sheets down tight without separate pilot drilling.
- Securing metal cladding and sheet material to timber battens is a standard job for roofing screws, especially where a sealing washer is needed to keep water out around the fixing.
- Installing galvanised roofing screws on agricultural buildings, workshops, and lean-tos helps hold corrugated or box profile sheets in place through wind, vibration, and weather changes.
- Replacing failed or rusted fixings on existing roofs is quicker with tek screws and roofing screws with washer assemblies, as they let you swap out tired fixings without disturbing whole runs of sheet.
Choosing the Right Roofing Screws
Sorting the right one is simple: match the screw to the sheet, the support underneath, and the weather seal you need.
1. Steel or Timber Underneath
If you are fixing into light steel, go for self drilling roofing screws or tek screws for steel so the point drills and taps in one hit. If you are fixing into timber battens, use a roofing screw made for timber thread engagement, otherwise it can spin, bite poorly, or loosen off later.
2. Get the Length Right
Do not just buy the longest screw on the shelf. You need enough length to pass through the sheet and washer and still get proper purchase in the support. Too short and it barely holds. Too long and you are wasting money while leaving excess thread hanging below.
3. Washer Quality Matters
If the roof has to stay watertight, do not skip roofing screws with washer assemblies. The sealing washer is what stops water tracking down the fixing hole. Poor washers perish, crack, or compress badly, which is usually where call-backs start.
4. Coating for the Environment
Galvanised roofing screws are a sensible choice for exposed external jobs, farm buildings, and general sheeted structures. If the fixing is living outside year round, basic interior fixings are a false economy and will soon show it.
Who Uses These on Site?
- Roofers use roofing screws for fixing metal sheets, flashings, and box profile panels, especially on jobs where the washer has to seal first time and stay put through bad weather.
- Steel erectors and cladding crews rely on tek screws for steel because they can fix straight into light gauge sections without wasting time pre-drilling every point.
- Farm and industrial maintenance teams keep metal roofing screws on the van for patch repairs, sheet replacement, and stopping small leaks before they turn into bigger faults.
- General builders and shed installers use these when fixing sheets to timber rails or steel frames, matching screw length and thread to the backing material so the roof stays tight and dry.
Roofing Screw Accessories That Save Time on Site
A few simple extras make fixing cleaner, quicker, and far less likely to end in stripped heads or leaks.
1. Washers
If you are replacing tired fixings or matching older assemblies, spare Washers stop you trying to reuse perished seals that are already flattened or cracked. It is a cheap fix compared with chasing drips later.
2. Power Tool Socket Sets
Most roofing screws are driven with hex heads, so a decent Power Tool Socket Sets setup helps you drive them square, avoid cam-out, and stop chewing the coating off the head.
3. Self Tapping Screws
Keep a few Self Tapping Screws handy for flashings, trims, and lighter sheet metal details where a full roofing screw and sealing washer setup is not the right fit.
Choose the Right Roofing Screws for the Job
Pick by what you are fixing through and what you are fixing into.
| Your Job | Roofing Screw Type | Key Features |
|---|---|---|
| Fixing box profile sheets to light steel purlins | Self drilling roofing screws | Drill point for steel, hex head drive, sealing washer, quick installation without separate pilot holes |
| Fixing corrugated or box profile sheets to timber battens | Timber thread roofing screws | Coarse thread bite, roofing screws with washer, good pull-down without overdriving |
| Repairing or replacing old farm building sheet fixings | Galvanised roofing screws | Weather resistant finish, external durability, suitable for exposed roofs and cladding |
| Fastening sheet metal trims and lighter steel details | Tek screws | Self drilling point, fast fixing into thin steel, ideal where full roofing fixings are not needed |
| Outdoor timber structures and external timber fixing | Exterior screws | For non-sheet external timber jobs, look at Decking & Exterior Screws for the right thread and coating |
Common Buying and Usage Mistakes
- Buying timber fixings for steel purlins is a common one. The screw either will not cut in properly or will take forever to fit, so use self drilling roofing screws where steel is involved.
- Choosing the wrong length causes no end of grief. Too short means poor holding power, while too long wastes money and can leave untidy thread sticking through below the sheet.
- Overdriving the screw and crushing the sealing washer is just as bad as leaving it loose. Compress the washer enough to seal, but do not flatten it to death or it will fail early.
- Using ordinary internal screws on exposed roofing jobs is false economy. They rust, stain the sheet, and fail far sooner than galvanised roofing screws made for outside use.
- Driving hex head roofing screws with worn or sloppy sockets rounds heads and slips off coatings. Use the right driver and replace tired sockets before they start costing you time.
Self Drilling Roofing Screws vs Self Tapping Screws vs Tek Screws
Self Drilling Roofing Screws
These are the right call for fixing roof sheets and cladding where you need both a drilling point and a weather seal. They are built to go through metal sheet and into the support below while the washer seals the hole.
Self Tapping Screws
Self tapping screws form their own thread, but they do not always drill their own hole. They suit lighter sheet metal details and pre-drilled work more than full roofing jobs where sealing and fast steel fixing matter.
Tek Screws
Tek screws usually refer to self drilling screws for metal, so they are ideal for steel framing and cladding rails. For roofing, make sure you are getting the proper head style and washer arrangement, not just any drilling screw.
Maintenance and Care
Keep Them Dry in Storage
Store roofing screws in a dry box or van organiser, especially once opened. Wet fixings rolling about with site dust soon lose their finish and make a mess of the next job.
Check Washers Before Use
Have a look at the sealing washer before you start a run. If it is split, hardened, or has pulled away from the metal cap, bin it. A bad washer is asking for leaks.
Use the Right Driver
A snug hex socket keeps the head clean and the coating intact. Worn drivers slip, chip the finish, and round the head, which makes any later removal far more awkward.
Replace Failed Fixings Early
If you spot rusting heads, lifted washers, or loose sheets on an existing roof, replace the suspect fixings before the weather gets in. Small maintenance jobs are cheaper than sheet damage and water ingress repairs.
Why Shop for Roofing Screws at ITS?
Whether you need a few replacement roofing screws for a repair or full boxes of self drilling roofing screws and tek screws for a fresh sheeted roof, we stock the proper range. That means sizes, finishes, and fixing types for steel and timber, all in our own warehouse and ready for next day delivery.
Roofing Screws FAQs
What are roofing screws used for?
Roofing screws are used to fix metal roofing sheets, cladding panels, and box profile sheets to steel purlins or timber battens. The big thing is the sealing washer, which helps stop water getting in around the fixing point.
What length roofing screw do I need for sheet metal?
You need enough length to go through the sheet and washer and still get proper bite into the support underneath. For thin sheet alone, you do not need loads of excess length, but for box profile roofing into timber or steel, make sure the screw reaches well into the backing material and holds without bottoming out.
Do roofing screws need a sealing washer?
Yes, for most external roofing jobs they do. A roofing screw without a proper sealing washer leaves the fixing hole exposed, which is where leaks usually start. If the roof needs to stay weatherproof, use the washer.
What's the difference between self drilling and self tapping screws?
Self drilling screws have a drill point that cuts its own hole as it goes, which is why they are so useful on steel. Self tapping screws cut or form a thread in material, but they often need a pre-drilled hole first. For roofing into steel, self drilling is usually the safer bet.
Can roofing screws be used on timber battens?
Yes, provided you choose the right type and thread for timber. Plenty of metal roofing screws are made to fix sheets into timber battens, but you still need the correct length and washer so the sheet pulls down properly without over-compressing the seal.
Will these hold on exposed roofs in bad weather?
Yes, if they are installed properly and matched to the sheet and support. The screw does the holding, but the washer, coating, and correct spacing all matter. Most failures come from the wrong fixing choice or overdriving, not the idea of using roofing screws itself.
