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For additional questions or support contact CertainTeed Commercial Roofing Technical Services Department 1-800-396-8134 x2 or rpg@saint-gobain.com

Gutter Seam

Preexisting Metal Roof (Coated)

1. SMARTCOAT 450 High Solids Silicone

2. Two Layers of SMARTCOAT 450 High Solids Silicone or One Layer 350/365 Silicone Mastic followed by One Layer 450

4. Two Layers of SMARTCOAT 450 High Solids Silicone or One Layer 350/365 Silicone Mastic followed by One Layer 450 over Fasteners

3. Inside of Downspout Insert, SMARTCOAT 450 High Solids Silicone - Do Not Extend into Downspout Vertical

Clean gutter interior. Surface must be free of dirt, dust, oil, grease, wax, rust, chalky or loose paint, mildew and any other surface contamination that may inhibit adhesion. NOTE: Recommended application thickness for SMARTCOAT 450 High Solids Silicone in a gutter are relatively high to accommodate for common debris and debris removal, increasing the risk of membrane puncture.

Gutter, Main & Downspout Insert Apply approximately 40 wet mils of SMARTCOAT 450 High Solids Silicone Coating with a brush. Do not extend coating into downspout vertical.

Gutter, Seams & Exposed Fasteners If utilizing only SMARTCOAT 450 High Solids Silicone, apply approximately 40 wet mils of SMARTCOAT 450 High Solids Silicone Coating with a brush. Allow to skin over such that a second coat would not displace first coat. Apply a second coat, approximately 40 wet mils thick of SMARTCOAT 450 High Solids Silicone Coating.

If utilizing SMARTCOAT 350/365 Silicone Mastic, apply with a brush, trowel or gloved hand at an approximate thickness of 1/4". Allow to skin over such that a subsequent coating will not displace material. Once sufficiently skinned/dry, apply a minimum 24 wet mils of SMARTCOAT 450 High Solids Silicone Coating with a brush

NOT DRAWN TO SCALE

CTL-SC-20STRuCTuRAl STAnDIng SeAM

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