FLAT Roof - Ice and Water Shield (I&WS)

Discussion in 'Remodel Forum & Blog' started by bjferri, Jun 28, 2011.

  1. bjferri

    bjferri DoD Army

    Messages:
    150
    Location:
    Maryland
    I always lean towards overkill unfortuanately - is it a good idea to I&WS the entire roof before installing the TPO / Duro-Last membrane?

    Thanks is advance...
  2. Dana

    Dana In the trades

    Messages:
    2,814
    Location:
    01609
    I'm not sure what the advantage of adding I &WS is- they're both vapor-impermeable. There may better materials for providing a slip-surface to minimize strains on the membrane too.

    There's a huge advantage to putting down a few inches of rigid foam insulation though- it blocks the thermal bridging of rafters leading to more even temps and less freeze/thaw stresses when there's a snow load, and keeps the roof deck & rafter tops warmer for far less winter moisture accumulation. In summer it blocks the thermal transfer of the short-circuiting rafters to the interior from the hot roof too.
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