buygrkfasteners.com: Selection Guide

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Complete Selection Guide

Climatek™ coated screws have been independently tested and approved for use in treated wood products. Our fasteners come with a limited Lifetime Warranty. For best performance use PHEINOX™ stainless steel screws by GRK.

Always build your project according to current ICC (International Code Council) specifications. GRK’s Climatek™ coating conforms with ICC-NES Report #NER-643, ICC-NES Report #NER-628 and ICC-NES Report #NER-669 which allows for use of triple zinc polymer coated fasteners in contact with ACQ treated woods.

Pressure Treated Lumber Decking:
Use #9 or #10 gauge R4™ on deck boards. For Southern Yellow Pine use #10. For best performance use PHEINOX™ stainless steel screws by GRK.

Cedar & Redwood Decking:
Use #9 or #10 gauge GRK R4™ to lock wood in place. Countersink screws by 1/8" and seal wood immediately with a quality sealer to lessen the likelihood of tanic acid stains. For best performance use PHEINOX™ stainless steel screws by GRK.

Tropical Wood Decking: (e.g. Mahogany, Ipe, etc.)
Use PHEINOX™ stainless steel screws by GRK. Due to movements of these woods many importers recommend pre-drilling.

Composite & Plastic Decking:
For best performance use PHEINOX™ RT Composite™ stainless steel screws by GRK.

Ledger Boards & Structural Parts:
Use RSS™ Structural Screws by GRK as a lag screw alternative to get exceptional strength.

Concrete & Masonry:
Use Caliburn™ Screws by GRK.

Pools, Hot Tubs, Saunas:
Use only PHEINOX™ stainless steel screws by GRK.

No pre-drilling for R4™, RSS™, Cabinet™ and Trim™ Head screwsexcept where wood limitations require.
Always place deck boards with outer edge of growth rings facing up(bark side up).
DO NOT use deck cleaners which contain bleach with coated metals.
Always consult wood supplier's / manufacturer's recommendations.
Decking screws should be countersunk 1/8".