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Insulation Techniques
The Whaler System
Whalering is required in the same way cement forms are required for certain applications. This sheet deals with situations where rafters or joists are going to stand proud and sheet rock or some other surface material will be inset between them. Failure to properly whaler may lead to expensive re-work. Our experience is that many knowledgeable contractors have underestimated what is required to properly whaler a job and thus we have come up with this sheet. Bear in mind as you read this that our intent is to create a system that will not fail because this is a situation where "an ounce of prevention.....
It is also true that properly whalered jobs can be foamed easily with a minimum amount of time required to move the whalering up the wall/slope. Even when done properly whalering is less time and materials consuming than it would be to frame these spaces in the normal manner, foaming also goes faster when the whalering is done as described below. .
Here is what we have found:
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Use 2 x 4 lumber for the vertical spacers
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Use 2 x 4 lumber for the horizontal whalers
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Use sheet rock screws that are long enough to have 1.5 to 2.0" in the stud or rafter
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Adjust thickness by shimming between whaler and stud or rafter
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Whalers are spaced 2' on center starting at the bottom
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Braces are spaced as needed, but make sure that each vertical edge is supported.
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There should be enough braces in the middle so that there is no more than 1' of unsupported wall.
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We normally leapfrog up the wall in 4' increments by placing additional horizontal braces and sliding the vertical braces up. Using screws allows us to reduce the pressure.
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The images below illustrate the Whalering process.
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