Siding: 

Kaycan.com 
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Edcoproducts.com 
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Cranesiding.com 
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Variform.com

Shakes:

Foundrysiding.com

Siding & Windows:

Alside.com 

Windows:

Lindsaywindows.com
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Amcraft.com
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Patio doors:

Decking: 

Timbertech.com

Shingles:

GAF.com

Decorative Accessories:

Fypon.com