FAQ – Questions and answers
The most common questions in construction
DEKS Blue Line EPDM Washer Installation Guide
DEKS Blue Line EPDM Washer Installation Guide 
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BUILDING IT RIGHT TO MAKE IT WATERTIGHT
DEKS Blue Line EPDM provide an excellent waterproof seal— even under the most severe weather conditions— if properly installed.
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The trick is not to overdrive or underdrive the screws.
If the screw is not tightened enough, moisture leaks around the washer. An overtightened screw squishes the washer too thin, which can also result in leaks.
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Important Tip:
Replace worn sockets immediately if they cause the screw to wobble during installation. Crookedly driven screws can cause water leaks.
Self-Tapping vs. Self-Drilling Screws: Do You Know the Difference?
Self-Tapping vs. Self-Drilling Screws:
Do You Know the Difference?
- Self-Drilling Screw – Steel Sheet / Steel Purlins
Trident Drill Point
✔ Improved Drill Performance
✔ Time Saving
- Self-Tapping Screw – Timber
Type 17 Sharp Point
✔ Reduce Splitting
Patented Trident Drill Point
Patented Trident Drill Point
The patented Trident Drill Point provides fast and
steady drill performance, effectively clears swarf,
and drills through 6mm thick steel.
“S” Swirl: Creates a larger area of engagement from the initial drill drive.
Improved “Cutting Edge” Design: Larger, curved cutting blade edge lower manual load required.
Incorrect screws create stress cracks and thus leakage on Polycarbonate or other Plastic Sheets
Incorrect screws create stress cracks and thus leakage
on Polycarbonate or other Plastic Sheets.
BDN Fsateners – POLYXPAND™ (Skylight Fixing Fasteners)
True Australian AS3566 Standard Hex Washer Flanged Head:
Separate EPDM steel bonded washer NOT required. (No risk of leakage)
Thermoset 100% EPDM BAZ washer:
☑Weathering Resistant (UV / Ozone / Acid)
☑100% Leak proof sealing
☑Perfect fit under hex washer flange
☑Optional metal washer add-on
☑Shock absorbing (for high wind areas)
Creates a 10mm dia:
Thermal expansion hole for plastics.
Winged Drilling Tip:
Wings break off once in contact with the steel purlins,
keeping the plastics sheets securely fastened.
BDN Fasteners Surface Coating Class
BDN Fasteners – Surface Coating Class
Corrosion Resistance
- Class2 – SST 500hrs + Kesternich 5 Cycles
- Class3 – SST 1000hrs + Kesternich 7 Cycles & 15 Cycles
- Class4 – SST 2000hrs + Kesternich 15 Cycles
✓ Australian AS3566 Standard
✓ SGS Certified
True Australian Standard-AS3566
The BDN Comparison-AS3566
BDN Fasteners
True Australian Standard-AS3566
Washer Diameter=13.97-14.78mm
Scratshank
SCRATSHANK
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Cutting / Break out the metal filings
Remain free of damage to sealing washer during installation – Weatherseal
Double Scratshank: Swarf Free
Double Scratshank: Swarf Free
BDN Fsateners – Dual-Tite™ (Roofing Screw Duofix 2 IN 1)
Double Scratshank: Removes sealing washer damaging swarf during installation.
Harpoon Thread: Anti-stripping, roof fixing threads
Harpoon Thread: Anti-stripping, roof fixing threads
BDN Fsateners – Dual-Tite™ (Roofing Screw Duofix 2 IN 1)
Harpoon Thread: Anti-stripping, roof fixing threads
BDN Fasteners 100% Weather Sealed
DEKS Dekseal® Trueblue® 100% Weather Sealed
BDN Fasteners – B//> Series: Silver Blue / SST 5000hrs / Kesternich 5 Cycles
- Hex Washer Flange: True Australian Standard-AS3566
- DEKS Dekseal® Trueblue® 100% Weather Sealed
- 100% Made In Taiwan
DEKS Dekseal® Trueblue® 100% Leak proof sealing
DEKS Dekseal® Trueblue® 100% Leak proof sealing
BDN Fasteners – BN3 Series: Silver Grey / SST1000hrs / Kesternich 7 Cycles
- DEKS Dekseal® Trueblue®: 100% Weather Sealed
- Hex Washer Flange: True Australian Standard-AS3566
- 100% Made In Taiwan
