Vinyl siding profiles that have broader butt edges tend to be more rigid and to stay straighter than designs that have shallower butts. This siding doubles over the nailing hem completely for more strength.

This siding just folds over the top edge of the hem.

Vinyl siding with integrated foam backing or drop-in foam backing keeps its shape better, offers greater impact-resistance, and adds a layer of insulation for a higher R-value.

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