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The Natural Philosopher
 
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Default Raising Roof Joists for Loft Flooring

Ian Stirling wrote:
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".


....that is laying horizontal.

Orthogonal is better. Less implications of verticality.,