How To Determine Lap Siding Exposure Width

The recommended exposure distances exposure distance is the amount of siding left exposed to the weather are 4 inches for 6 inch siding 8 inches for 10 inch siding and so on as shown in figure 3.

How to determine lap siding exposure width.

The average exposure distance is usually determined by the distance from the underside of the window sill to the top of the drip cap fig. Add these measurements and enter them here. James hardie provides exposure options lap 5 6 7 8 and 10 in the lap siding panel 4 x 8 4 x 9. Lap clapboard or beveled siding should lap no less than 1 inch and preferably 2 inches.

The exposure of the board is the amount of the board that is exposed to the elements. Figure 4 3 installation of bevel siding. The standard new construction siding and most economic option is a 7 reveal exposure 8 1 4 james hardie plank board with a 1 overlap per james hardie elite contractor preferred guidelines. The exposure is what will be used to determine the number of courses needed for the wall and ultimately to find the number of linear feet of siding needed.

Measure the width and height of windows doors and any other areas that will not be covered with siding. Exposure the minimum lap for bevel siding is 1 inch. This can be found by subtracting the overlap of the boards from the actual board width.