from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Wood, felt, or other material placed under the shingles of a roof in order to provide support or insulation; the practice of furnishing roofs with such material; an installation of such material.
from the GNU version of the Collaborative International Dictionary of English
- n. Thin boards for sheathing, as above the rafters, and under the shingles or slates, and for similar purposes.
from The Century Dictionary and Cyclopedia
- n. Thin boards for lining, etc.; specifically, the boarding on which slates are laid.
Sorry, no etymologies found.
Underlay or sarking should not be necessary and will hinder ventilation.
During some alterations which were made to it in 1798, a richly inlaid but wasted dagger was found stuck in the sarking of the roof, supposedly by the murderers of Rizzio on their escape from the palace.
The building was roofed with teak timber, with a sarking of lighter wood as a lining to form a contrast, and then covered with slates imported from England.
As I have often explained previously in this column, once the roof has been tiled or slated, sarking felt serves no further useful purpose.
If you stick your head through the loft hatch on one of these cold nights, I'll bet you will see condensation running down the underside of the sarking felt or roof slates.