Sharp MD-S10E Specifications download pdf (Page 16)

STANDARD SPECIFICATION - BUILDINGS

DPI REFERENCE TEXT - APRIL 2009

PAGE 16

6. INSULATION AND SARKING

6.1 GENERAL

Interpretation

Sarking-type material: Flexible membrane material

normally used for waterproong, vapour retarding

or thermal reective insulation.

6.2 MATERIALS AND COMPONENTS

Bulk insulation

Cellulosic bre: To AS/NZS 4859.1 Section 5.

Mineral blankets and cut pieces to AS/NZS 4859.1

Section 8.

Glass bre in loose ll: To AS/NZS 4859.1.

Polystyrene: Moulded rigid cellular sheets: To

AS1366.3.

Polystyrene: Extruded rigid cellular sheets: To

AS 1366.4.

Wool: To AS/NZS 4859.1 Section 6.

Sarking membrane

Standard: To AS/NZS 4200.1.

Wire support to roof insulation

Use support mesh of 1.25 mm diameter galvanized

wire welded in a grid of 100 x 115 mm.

Welded safety mesh to statutory requirements may

also be used to support sarking.

Standard: To AS/NZS 4389.

Size: 300 x 150 grid of 2 mm diameter galvanized

wire.

6.3 INSPECTION

Notice - Witness Point

Witness Point: Give sufcient notice so that the

sarking, vapour barrier and insulation may be

inspected before it is covered up or concealed.

6.4 INSTALLATION

Bulk insulation

Standard: To AS 3999 and BCA Clause J1.2.

Batts: Fit tightly between framing members. If

support is not otherwise provided, secure nylon

twine to the framing and stretch tight.

Insulation material: 75 mm thick breglass blankets

or batts with a minimum R value of 2.0.

Bonding: Where required provide insulation blankets

factory bonded to aluminium foil sarking material.

Sarking material

Standard: To AS/NZS 4200.2.

Proprietary Item: Bradford Thermofoil 753 (heavy

weight).

Wall sarking

General: Provide sarking where shown on the

drawings and behind cladding which does not

provide a permanent weatherproof seal, including

• boards xed vertically or diagonally;

• boards or planks xed in exposed locations

INSULATION AND SARKING

where wind driven rain can penetrate the joints;

• unpainted or unsealed cladding.

Installation: Apply to the outer face of external stud

walls from the top plate down over the bottom plate

and ashing. Run across the studs and lap at least

150 mm at joints. At windows run over the head

ashing.

Where the wall sarking also acts as vapour barrier.

Lap and seal as for roof sarking to form a continuous

air tight seal.

Roof sarking

General: Provide sarking to metal roofs as detailed

on the drawings.

Installation: Lay the sarking to the whole of the roof

area running parallel to the purlins or battens and

lapped 150 mm over the purlins or battens.

Use support mesh to sarking on exposed roofs.

Ridge ventilation: Finish sarking at least 50 mm

clear of ridges.

Combined Insulation and Sarking

Use a medium weight reective foil factory bonded

to a 75 thick breglass blanket with a minimum R

value of 2.0.

Vapour Barrier

Requirement: Where the sarking also forms a

vapour barrier seal the laps and penetrations with

heat resistant pressure sensitive tape 75 mm wide

to form a continuous air tight seal and seal to the

walls with timber battens.

Ensure that the laps are mechanically fastened.

Specifications March 2009.indd 16 11/03/2009 11:47:10 AM

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