What Is Lap Siding?


Lap siding is a type of siding product designed to form an overlapping pattern. The individual boards are wedge shaped, with the top edge of the board narrower than the lower edge. This shape facilitates the overlapping installation.


  • Lap siding is a style of siding available in a variety of different materials, including wood, vinyl and fiber cement board.


  • Install lap siding with corrosion-resistant nails driven through the top portion of the board that will be covered by the course or board above.


  • Lap siding creates a water-resistant shell over the structure of the house. The overlapped pattern of the individual boards sheds water and prevents it from penetrating the siding.


  • Paint or stain permeable siding to protect the material from exposure to the elements. Certain types of siding, such as vinyl, do not need to be finished.


  • Apply house wrap or sheathing to the exterior of the house prior to installing the lap siding boards. This will protect the house from any residual moisture that might penetrate seams in the siding.

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