Design Tables

Insulation
Insulation Council Handbook A handbook, available at the link, which gives calculations for various parts of a house with combinations of insulation materials.

Insulation
‘k’ Values

Timber

There are several downloadable span tables for decks, pergolas etc at Thora Timbers so if you live close to Brisbane check them out

Timber Retaining Walls
Queensland Design Guide

Windows (Double Glazing)
You can check the performance of various manufacturer’s units at WERS (Window Energy Rating Scheme)