No Plugs, No Problem: The Trade Guide to Concrete Screws and TechFast Fixings
If you’re still messing around with plastic wall plugs and mismatched drill bits while the rain is coming sideways, you’re doing it the hard way. In the trade, time isn't just money: it's the difference between getting to the pub at 5:00 PM or still being on-site at 7:30 PM trying to coax a plug into a hole that’s slightly too big.
At Glazing Supplies Direct, we’re big fans of anything that makes an installation faster, stronger, and less of a headache. That’s why we’re talking about the holy grail of modern fixings: Concrete Screws and TechFast Window Screws. No plugs, no faff, just solid fixings every time.
What Are Concrete Screws?
Concrete screws, often called masonry screws or "concrews," are high-strength fasteners designed to thread directly into masonry materials. Unlike traditional screws that require a plastic anchor (plug) to expand against the sides of a hole, these screws cut their own thread into the substrate.
Why Are They Better Than Plugs?
- Speed: You save up to 60 seconds per fixing. In a house full of windows, that’s hours of labour saved over a week.
- Strength: They provide a massive amount of grip because the entire length of the screw is engaged with the masonry, not just the part where a plug expands.
- Edge Distance: Because they don't use expansion force, you can fix them closer to the edge of a brick or stone without the risk of splitting the material.
- Removability: Need to adjust a frame? You can back a concrete screw out and drive it back in. Try doing that with a mangled wall plug.
Pro Tip: Always clear the dust out of the hole before driving a concrete screw. If the dust compacts at the bottom, the screw will bottom out and potentially snap or spin. A quick blow with a pump or a flick of the drill bit makes all the difference.
Why Switch to TechFast Window Screws?
While concrete screws handle the heavy lifting into the walls, TechFast Window Screws are the specialist tool for joining PVCu sections and bay poles. If you’ve ever fought with a screw that refuses to bite into a metal-reinforced frame, these are your new best friend.
Key Features of TechFast Fixings:
- Self-Drilling Point: The sharp, self-piercing tip eliminates the need for pre-drilling into metal-reinforced PVCu.
- Torx Drive: Most TechFast screws use a Torx-compatible drive (usually T20 or T25). This means no more "cam-out" or stripped heads when you’re leaning into the drill.
- Corrosion Resistance: Our range features Elementech coating, salt-spray tested to 1000 hours. This is vital for external glazing that needs to survive the British weather.
- Low Profile Heads: Usually featuring a wafer or pan head, they sit flush and don’t interfere with the movement of the window or door.
How to Install Concrete Screws Correctly
Moving away from plugs requires a slight change in technique. Follow these steps for a "no-plug" install that won't budge:
- Drill the Pilot Hole: Use a masonry bit that matches the screw’s core diameter (usually 6mm or 6.5mm for a standard 7.5mm concrete screw).
- Drill Deeper Than the Screw: Always drill the hole 10mm deeper than the screw will reach to allow space for residual dust.
- Drive the Screw: Use an impact driver or a high-torque drill. Don’t over-tighten; once the head is flush against the frame or washer, stop.
- Check the Bite: You should feel the screw "bite" into the masonry. If it spins freely, you’ve likely hit a soft mortar joint rather than the brick or stone.
When Should You Use Which?
Not every fixing is born equal. Choosing the right one depends on what you’re hitting.
| Substrate / Application | Recommended Fixing | Why? |
|---|---|---|
| Solid Brick / Concrete | Concrete Screws | Direct thread-cutting provides maximum grip. |
| Metal-Reinforced PVCu | TechFast Screws | Self-drilling tip handles the internal steel reinforcing effortlessly. |
| Bay Pole Joining | TechFast Baypole Screws | Specifically designed with a wafer head for a flat finish. |
| Soft Timber / Studwork | Timber Screws | Standard wood threads are better for fibrous materials. |
Factors to Consider:
- Substrate Quality: Concrete screws are gods in solid concrete but can struggle in old, crumbly mortar. If you’re working on a Victorian renovation, always aim for the center of the brick.
- Coating: Always ensure your fixings are coated for external use. Zinc-plated is fine for indoors, but for windows, you want Elementech or similar high-grade coatings to prevent rust streaks down a white frame.
Trade Efficiency: The Glazing Supplies Direct Advantage
We know you don't have time to wait around for parts. That’s why we stock a full range of glazing materials that are trade-tested and ready to go.
- No Trade Account Required: Get trade prices from day one, whether you’re a national contractor or a DIYer doing a weekend upgrade.
- Next-Day Delivery: On all in-stock items, because we know "next week" is too late when you have an open hole in a customer's wall.
- Free Delivery: Spend over £50 and we’ll drop it to your door or site for free.
While you're grabbing your fixings, don't forget to check our guide to glazing packers to ensure your frames are perfectly level before you drive those screws home.
Frequently Asked Questions
Do I really not need a plug for concrete screws?
Correct. The threads of a concrete screw are designed to cut directly into the wall. Adding a plug will actually prevent the screw from working as intended and may cause the masonry to crack.
What size drill bit do I need for a 7.5mm concrete screw?
For most 7.5mm screws, a 6mm or 6.5mm masonry bit is standard. Check the specific manufacturer's recommendation on the box, as different substrates (like hard blue brick vs. soft aerated block) might require a slight adjustment.
Can TechFast screws be used in timber?
While they can go into timber, they are optimized for metal and PVCu. For timber-to-timber applications, a dedicated timber screw will provide a better hold due to the wider thread pitch.
Why do my concrete screws keep snapping?
Snapping usually happens for two reasons: the pilot hole is too small/shallow, or you’re using a drill with too much torque and no clutch. Ensure the hole is clear of dust and use a controlled driving speed.
Upgrade Your Van Stock Today
Stop wasting time with outdated fixing methods. Switch to Concrete Screws for your frame-to-wall fixings and TechFast for your PVCu-to-metal needs. You’ll work faster, the finish will be cleaner, and your arms will thank you at the end of the day.
Ready to gear up? Browse our full range of trade-quality screws and fixings here and get free UK delivery on all orders over £50.