In the case of 2x6 joists you can pair them up with additional 2x6 joists by nailing them together side by side.
Attics joists creak and pop.
In older home attics unsettling bangs are more likely to be the sounds of trusses joists rafters and sheathing expanding or contracting as the roof heats up or cools down.
If your attic already has insulation it is probably useless for your intended attic remodel.
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The attic is one of the most unused and under designed spaces of a home.
How to build attic flooring on joists.
Popping is a common way to describe a variety of noises that a house makes and the causes are varied.
Often minimal live load requirements are four times that of dead loads.
But live loads are a different matter.
If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists.
All attics joists can carry a minimal dead load weight i e 10 pounds per square foot.
Sistering is the process of adding a new joist next to each existing joist.
Metal roofs are major offenders but shingled roofs also can be quite noisy.