Hello,
I am renovating a guesthouse built in 1981.
One of the tasks has involved tearing up the chipboard flooring in the laundry room and kitchenette. I then discovered that the foundation is made of lecablock, and in this "frame" there is compacted/vibrated sand, on this 10cm insulation, and on this a durable plastic. Between the plastic and the chipboard there is a 2-3 mm masonite sheet.
My question is why is this there?
//Somewhat knowledgeable but much to learn
I am renovating a guesthouse built in 1981.
One of the tasks has involved tearing up the chipboard flooring in the laundry room and kitchenette. I then discovered that the foundation is made of lecablock, and in this "frame" there is compacted/vibrated sand, on this 10cm insulation, and on this a durable plastic. Between the plastic and the chipboard there is a 2-3 mm masonite sheet.
My question is why is this there?
//Somewhat knowledgeable but much to learn
I would guess that it was primarily used to protect the plastic when the floor chipboard was laid. Chipboard is heavy, and moving it around with just plastic underneath would definitely move/damage the plastic. With board in between, friction is reduced, and the plastic is protected.