MIL-HDBK-1001-5 Roofing And Waterproofing S/S By Mil-Std-3007This handbook sets forth guidelines for design of roofing, LAYOUT 1 and waterproofing systems for building construction. It covers design of new low-slope and steep roof systems, reroofing of existing buildings, and waterproofing, and dampproofing systems.

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MIL-HDBK-1001/SA

Section 10: REROOFING

10.1 Introduction. Reroofing is necessary when it is no longer economically viable to maintain the existing roof. Reroofing options are recovering or replacement. However, the recover option is usually not the best option. Before deciding on either option, determine why the existing roof failed.

10.2 Reroofing. Reroofing of steep roofing usually requires removal of old materials - either total or individual removal of cupped, wrinkled, or other damaged units - in tile and slate roofs. For these materials, reroofing is governed by the same criteria as new construction.

For asphalt and wood shingles and shakes, however, recover roofing is an option. Asphalt shingles can be applied over old asphalt shingles or old wood shakes or shingles and, conversely, wood shakes and shingles can be applied over old asphalt shingles. Roll roofing can sometimes be safely recovered with asphalt shingles, but it is generally prudent to remove old roll roofing before asphalt shingle replacement. For guidelines on repairs, substrate examination, and preparation required

before recovering old steep roofing, consult the NRCA Steep

Roofing Manual and the ARMA Residential Asphalt Roofing Manual.

10.3 Premature Failure Preliminary Investigation. Analyze the roof with the following in mind:

a) Structural conditions contributing to the roofing

problem;

b) Interior space psychrometrics contributing to the roofing problem;

problem.

c) Topside deficiencies contributing to the roofing

10.3.1 Structural Influence. The existing roof deck, supporting structure, and, in many cases, wall sections projecting above the roof elevation have a direct bearing on the longevity of the roofing composite. Structural influences to be considered include the following:

a) Type of roof deck material;

b) Deterioration of roof deck and/or structure;

c) Deflection of roof deck and/or structure;