Install 1 2 inch 12 7 mm foam sheathing strips on both sides of each corner then install your corner siding pieces to these strips.
How to install vinyl siding inside corners.
Position starter strip with the top edge of chalk line and allow room for corner posts.
The way to allow for this expansion is to install the corner post down from the soffit or top of the corner.
Installing inside corner.
Expansionwhen the temperature changes vinyl siding expands and contracts.
Hammer the first nail into the nailing slot.
The corner posts should run from 3 4 inch 1 9 cm below the bottom of the starter strip to just beneath the eaves after the soffit pieces have been installed.
Install the corner posts.
Find the lowest corner of the old siding or sheathing on the house.