Raising Roof Joists for Loft Flooring
The Natural Philosopher wrote:
Lobster wrote:
When topping up old insulation (Rockwool) it's normal and more effective
to lay the second layer perpendicular to the first.
I think you mean 'orthogonal'
Perpendicular is walls... ;-)
Umm, no.
Perpendicular can also mean simply "a straight line at right angles to
another line".
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