United Roofing's Blog

Minnesota Residential Roofing Services Minneapolis MN

Re-roofing – Tear off and Roof Recovery MN Re-roofing – Tear off and Recovers There are two options available for re-roofing installations.  One would be to tear off the old roof before applying the new one (tear off).  The second would be to lay new shingles over the existing roof (lay over).  While the second choice is the less expensive of the two options, it is not necessarily always the best choice. Is It Always Necessary To Tear Off Existing Shingles Before Reroofing? There are advantages to tearing off the old roof before installing a new one.  For example: If there are any defects in the roof deck, they will be revealed when the roof is torn off. These defects should be repaired before applying the new roof. If condensation problems exist in the attic, they too will be revealed when the roof is torn off. Properly designed attic ventilation can then be installed in order to help eliminate such problems. When the old roof is torn off, waterproofing shingle underlayment can be installed before applying the new roof.  This will help protect against leaks created by cyclical ice damage and wind-driven rain. Tearing off the old roof and starting with a clean deck before reroofing may result in a smoother finished roof system. Although there is added cost to these advantages, each lessens the likelihood that the validity of the manufacturer’s shingle warranty will be impaired.  If the old roof is torn off, your contractor should be responsible for the cleanup and disposal of the old shingles, but make sure your contract states this clearly. If you do plan...

Condominium Roofing – Replacement or Recovery

Condominium Roofing – Replacement or Recovery – Defining the Difference Many Minnesota condominium associations will be contemplating reroofing projects in the upcoming months as melting snow and spring showers cause water infiltration problems. This can be a complicated and expensive proposition, particularly for the low slope “flat” roofs. All reroofing projects fall into two categories: roof replacement, or roof recovery. It is crucial that a building owner understand the difference between these two reroofing options. Roof Replacement A roof replacement project involves complete removal of all existing roofing materials down to the structural deck. The deck should then be inspected and repaired, if necessary. Finally a complete new roof system is installed. The new system generally consists of an insulation bed, a waterproof membrane, and some type of surfacing. Roof Recovery In a roof recovery project the existing roof assembly is left in place and the new roof system is installed directly over it. Although there are rare instances when this approach makes sense; in general, it is poor roofing practice to recover an existing roof. Condominium associations most often decide to recover roofs, instead of replacing them, because of the initial savings in cash outlay. However, just because an option costs less up front does not mean that it is financially wise. For a number of reasons, recovering a roof can end up costing an association much more over the long term than a complete roof replacement. New Roof Over Existing First, an association must remember why they need a new roof. The roof in place has likely failed. It is no longer capable of providing the building...
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