1. First and foremost to see what is under the roof. ( A roof can have other roofs below ).
2. It is important to see what type of roof deck is under the roof. - The most common roof deck is steel. If it is not a steel deck then it is
either wood, gypsum, Tectum or concrete . If you have a roofing contractor come.
and take measurements and does not take a 'Core Cut' he is doing you & himself a huge injustice.
A) He will have no idea if there are other roofs below.
B) If there is one other or even two other roofs below, the contractor will not know on how many dumpsters will be required for the
removal and disposal, of the top roof and whatever might be underneath.
C) If there are three roofs that have to be cut off , labor cost for the tear off will be three times more than if there was only one roof and
the contractor will have to pay for 3 times more in dumpsters.
3. If there is no "Core Cut" taken the contractor will not know if there is wet insulation below, (unless your willing to pay for a "moisture
4. If there is no "Core Cut" the contractor can only hope for the best scenario, which would be, the roof that is exposed is the only one
and the deck below is steel (usually 22 gauge prime painted "B" decking)
5. Finally if there is no "Core Cut" , and the existing roof is removed and properly disposed of the contractor will have no idea on how
to secure the new insulation . If the 'deck' is steel the new insulation (which is not wet), can stay. You will only have to pay for new
insulation provided by the contractor that is wet !
6. If you have a concrete deck the contractor should install all the of the new insulation by adhering it to the concrete with a foam adhesive.
7. If a 'Core Cut' or multiple 'Core Cuts' were taken , you and the contractor will learn exactly how many roofs have to removed , if you still
have a lot of dry insulation that can stay and how much wet insulation will be disposed of and how many pieces of new insulation will be
needed, & how to secure the new insulation, preferably , two layers of "Polyisocyanurate" with an R-value = 20, can be secured with a
three inch round "Galvalume " plates with a minimum of a 4.5 inch screw in the middle of each plate, that will fasten the two layers of
Extend the life of your roof, by keeping up with preventative maintenance, according the "NRCA" National Roofing Contractors Association 30% - 200%
How can I extend the life of your roof ? Extending the life of your roof by regularly have preventative maintenance done, according to the "NRCA .
Watch the video above, which shows why you should take "Core Cuts" or a "Core Sample of your roof !!
8 MORE REASONS ROOF SYSTEM CORE CUTS ARE NECESSARY
MARCH 25, 2018
If you’ve ever been told that you need a core cut, you may have been stumped about why. Cutting into your roof is just the kind of thing you’ve been trying to avoid after all, so a core cut may seem crazy. It’s not, though.
A core cut, by definition, is when the layers are cut through and removed to examine a sample of the existing roof system. The objective (i.e. reason for the core cuts) will determine the quantity and their locations.
A core cut is necessary to:
Examine the roofing system for moisture and determine how much is present.
Determine the types and characteristics of the existing roofing materials.
Complete a thorough roofing survey.
Assess the structural integrity of the roof deck. Metal corrodes. Concrete spalls. It’s important to determine if deck replacement or preparation is needed.
Determine the type of roofing project your contractor will execute. A core cut will reveal whether a recover is possible (is there already two roof systems in place?) or if partial tear-off or a total re roof is necessary.
Calculate the cost of the project (e.g. dumpster feeds, labor hours required to tear off the roof, etc.).
Discover the slope of the insulation and maximum and minimum thicknesses. This is required for the contractor to plan for the correct size of screws used in a mechanically fastened system.
Ensure that the new roofing project will be done according to code (i.e. weight, slope, fire rating, uplift, etc.).
Most often, core cuts are taken when the building owner or facility manager wants to have work performed on the roof. More information is needed by the roofing contractor before the project can be determined and scope of work planned. This can help develop an accurate estimate and prevent unexpected expenditures due to unforeseen conditions as the project progresses.