MH Belly Repair - Rigid Bottom Replacement

Select sealants that:

are compatible with their intended surfaces,

allow for differential expansion and contraction between dissimilar materials,

meet the requirements of the applicable fire safety code (e.g. thermal or ignition barriers), and

for use inside the pressure boundary select low volatile organic compound (VOC) sealants that meet independent testing and verification protocols

Select materials that:

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers),

create a continuous insulation layer when possible (i.e., rigid insulation board), and

rigid materials that adequately support applied load and are permanent air barriers

Install support material for spans wider than 24", except when air barrier material is rated to span greater distance under load (e.g., wind, insulation)

Support material will support applied loads without sagging, bending, or failure

Cover entire area with as few pieces of rigid material as possible

Attach rigid belly material to sub-framing every 6" where possible with mechanical fasteners that penetrate sub-framing a minimum of 1-1/2"

Use mechanical fasteners that incorporate washers/caps that prevent fasteners from being pulled through belly material

Apply a continuous seal at all seams, cracks, joints, edges, penetrations, and connections of the belly material while applying sufficient pressure to push sealant into any gaps or cracks and contact any backing or infill material required

Install only noncombustible materials and sealants with an ASTM E136 listing in contact with any device producing 200 degrees F or more (chimneys, vents, flues, etc.)