Dimple Sheet Nails with EPDM Washer | 30 x 4 mm | 20 pieces in a Pack

Perfect For Securing Dimple Drain Sheets, Geotextiles & Waterproofing Membranes, Dimple Sheet Nails (Fixing Pins) with EPDM Washer

These dimple sheet nails are designed specifically for fixing dimple drainage sheets, geotextile membranes and protection boards to masonry, concrete and timber. The wide EPDM washer protects the dimpled core and sealing against moisture while providing reliable mechanical retention during backfilling. Ideal for retaining walls, basements, foundations and other drainage/waterproofing applications.

Specifications

• Size: 30 x 4 mm (length x shank diameter)
• 20 pieces in a pack
• Head/Washer: Moulded EPDM rubber washer (conical profile) bonded around the shank to protect dimples, seal against moisture and prevent fabric pull-through
• Nail Head: Flat round steel head for even drive and secure hold
• Material: Hot-dip or zinc galvanized steel shank for corrosion resistance in damp environments (specify galvanizing grade when ordering for harsh or coastal sites)
• Shank Type: Smooth hardened steel shank with sharp point for easy penetration into timber, masonry with pilot or anchors
• Compatibility: Suits dimple drain sheets, drainage boards, geotextiles, moisture-barrier membranes and protection felts
• Pack Size: 20 pieces in a pack

Why use these nails?

• Protects dimples: The EPDM washer spreads load and prevents the dimple cores from being crushed or pierced when fixing.
• Weather resistant seal: EPDM provides long-term elastic sealing against soil moisture and prevents ingress at the fixing point.
• Simple, fast installation: Sharp point and flat head make hand or hammer fixing quick; use pilot holes or anchors for solid concrete/blockwork.
• Durable: Galvanized steel shank resists corrosion for long service life in wet environments.
• Versatile: Works for vertical wall fixings, horizontal terminations and edge terminations on roofs, planters and slabs.

Common Applications

• Retaining Wall Drainage: Fastens dimple drainage sheets to wall substrate and keeps drainage channel intact during backfill.
• Basement Waterproofing: Secures protection boards and drainage membranes over waterproofing layers.
• Foundation Protection: Anchors membranes around footings to maintain continuous drainage and filtration channels.
• Planters & Green Roofs: Holds drainage layers along parapets and planter edges.
• Parking Decks, Slabs & Tunnels: Fixes edge terminations, overlaps and vertical membranes where mechanical retention is required.

Installation Guidance

• Position membrane with geotextile toward soil and dimples against the wall.
• Pre-press sheet flat and place fixings at recommended centres (typical: 300–600 mm along edges; 600 mm or more in field depending on substrate and local regulations).
• For masonry/concrete: pre-drill pilot holes and use appropriate anchors or plugs if necessary. For timber: drive directly with hammer or light impact driver.
• Don’t overdrive: Drive flush so the EPDM washer compresses enough to seal but does not deform the dimple profile.
• At overlaps/terminations: increase fixing frequency and consider using a termination strip or reinforced tape for added support.

Please browse our dimple sheet for purchase here.