An existing commercial roof covering is water soaked and has deteriorated so that it is not an adequate base for additional roofing. Under 2021 IBC 1512.2.1.1, may a new roof covering be installed over it as a roof recover?
- No; these conditions prohibit a roof recover.
- BYes, if the new covering conceals all visible tears.
- CYes, if one extra layer of insulation is added without addressing the existing condition.
- DYes, because roof-recover restrictions apply only to residential buildings.
Where to look it up
https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf
Why A is correct
A recover is prohibited when the existing roof or covering is water soaked or too deteriorated to serve as a suitable base. This is a specific reroofing restriction, not a rule that every torn membrane automatically requires replacement of the entire roof. Source: 2021 IBC 1512.2.1.1; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf