underlayment

(redirected from sarking felt)
Also found in: Thesaurus, Encyclopedia.

un·der·lay·ment

 (ŭn′dər-lā′mənt)
n.
See underlay1.

underlayment

(ˌʌndəˈleɪmənt)
n
(Building) US a lower layer as under carpet or roofing tiles
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.underlayment - a pad placed under a carpetunderlayment - a pad placed under a carpet    
pad - a flat mass of soft material used for protection, stuffing, or comfort
underfelt - a carpet pad of thick felt
References in periodicals archive ?
Work done included fully recovering the principal roof, with modern sarking felt below French reed thatching, which was renewed at the time.
2 the project shall consist (in summary of): (a) removal of existing slates containing asbestos by a licenced contractor (b) stripping back of roof and removal of damaged rooflights, battens and sarking felt (c) removal of lean-to flat roof canopy from north-west elevation of school and making good (d) removal and safe storage of natural slates for re- erection (e) insulation of existing flat roof (f) construction of upstands at base of two horizontal rooflights & re-erection of those rooflights (g) recovering of entire flat roof (h) repairs to natural state roofs (i) recover in new sarking felt and battens areas for artificial slates, including infill rafters to area where 4 no velux roof lights have been removed.
Instead, we line the underside with a black sheet material known as sarking felt.
Once the moisture is exposed to the cold underside of the sarking felt under the slates or tiles it can only mean one thing - condensation.
On older buildings which don't have sarking felt beneath the slates, a peep into the loft space without a torch will tell you where the slate has come from, as daylight will shine through.
The result of all of this extra humidity is a blue/grey bloom develops on the underside of the sarking felt and on the rafters.