All, I'm looking to increase the depth of my loft joists to allow deeper insulation coverage. Currently the depth is 100mm but want to increase them to accomodate upto 250mm. Should I lay the new wood @ 90 degrees to the existing ones or should I attach to them directly in line.
I was hoping to strengthen the existing ones as they have in the past had woodworm activity & some do actually resemble a fine swiss cheese in places but are still quite solid.
I will them place loosefill insulation in the voids created & chipboard T&G flooring on top to created a cover for storage.