installing homeflash


  • Caulking Gun
  • Trowel
  • Utility Knife
  • Staple Gun


  • 75 Feet of HomeFlash
  • 2 Tubes of Sealant
  • No-nailing/Non-decay Horseshoe shims


  • Window Sill Pan Flashing
  • Door Sill Pan Flashing

Step 1:

  • All rough openings must be framed in accordance with the window manufacturer’s specifications – vertically plumb, level, and square.
  • Surfaces must be clean, dry, dust-free, and free of any particles that could affect adhesion.

Step 2:

  • Cut a length of HomeFlash 30.48cm or 12 inches longer than the rough opening’s sill.

Step 3:

  • Staple HomeFlash skirting to the exterior surface of the substrate, ensuring:
  • The foam wedge is always inward facing, and sitting flat against the substrate, parallel with and above the rough opening sill plate
  • The HomeFlash should extend 15.24cm or 6 inches beyond each side of the rough opening jamb or trimmer stud

Step 4:

  • Carefully cut through the membrane and foam along the trimmer stud, stopping at the corner where the stud meets the sill plate.
  • Continue cutting horizontally outward parallel with the rough sill, continuing through the membrane and removing only this section.
  • Complete this task on both ends of the HomeFlash
  • Once complete, the membrane-covered foam section of the HomeFlash should sit snug between the trimmer studs on the top of the rough sill and slope from interior to exterior.
  • Make sure the membrane skirting component hangs down below the sill and extends outwards 15.24cm or 6 inches to either side of the rough opening.

Step 5:

  • Flip over the HomeFlash from the sill revealing the rough wood sill plate below.
  • Now remove the release film from both the top and bottom of the HomeFlash, revealing the peel-and-stick membrane.
  • Apply the HomeFlash sealant liberally over the corners of the rough sill plate and upwards onto the trimmer studs 15.24cm or 6 inches in either direction.
  • Fold the HomeFlash back onto the sill, embedding the foam component into the fresh sealant.
  • Tool the HomeFlash sealant back down from the trimmer stud onto the surface of the HomeFlash. Additional sealant should be applied, ensuring a sound moisture barrier at the inside corner where trimmer stud meets HomeFlash.
  • Also apply the HomeFlash sealant to the face of the rough opening, bridging the membrane and the substrate with a healthy coverage of no less than 15.24cm or 6 inches.
  • Now apply the no-nailing/non-decay shims immediately to the specifications of your window manufacturer.


  • Do not use two separate pieces of HomeFlash in one rough opening. The HomeFlash must be one continuous piece to ensure integrity.
  • Please ensure that the coverage of the sealant is liberally used to ensure consistency in depth and coverage
  • Please ensure the sealant is liberally applied at the jack stud and rough sill. Enough sealant should be used so that the sealant oozes up between the jack stud and the HomeFlash completely impregnating the HomeFlash within the caulking
  • Minimum code requires that building paper must be a least 6 inches past the rough opening.
  • HomeFlash can be installed with inside edge flush with the rough sill to 1 inch inside the rough sill to allow room for spray or bat insulation during window installation.