PAYMENT    

No credit cards.

Cheque or Direct Credit/electronic transfer to

ANZ Cheltenham, Victoria - Account: 013267-354873343
with confirmation of payment by fax or email.

International payments - use SWIFT CODE:  ANZBAU3M

CONCERTINA FOIL BATTS - SIZE & QUANTITY TABLES

CONCERTINA FOIL BATTS - SIZES

QUANTITY ESTIMATION PROCEDURE (Based on stapling)

CEILINGS (horizontal/flat)

INSTALLATION OPTIONS AND QUANTITY ESTIMATION

Concertina FOIL BATTS can be laid, timber visible, generally without need for stapling, in flat or horizontal ceilings. Unique triangular airspaces are formed, maintaining low emitting downward foil surfaces in summer (approx 3%), and conversely in winter, downward high reflective (97%). For effective control of summer radiant heat flow down, FOIL BATTS do not require 100% coverage or tight air seals. Cold climate winter convected heat flow up requires more attention for complete coverage and air seals, and bulk fibrous insulations are commonly recommended. In dual summer-winter climates, combination FOIL BATTS and bulk insulation R1.5-2.5 is superior to using R3.5 alone - FOIL BATTS adding approximately an additional R1.0 down and R0.5 up.

FOIL BATTS ceiling options:
a) placed on top of batt or loose-fill bulk insulation - no stapling, 50-100mm overlapping, air seals unnecessary.
b) inserted across ceiling battens (for 900-1200 centres), side stapled to joists and supporting fibre batts on top.
c) stapled and suspended tight between 450-600 centres, alone or supporting winter batt insulation.
Stop winter heat escape at open joist ends by fitting fibre batt directly to wall top plates, ie. no air gap.
d) 2 FOIL BATTS criss-crossed between joists.

QUOTATION- Insulation Management Guide for Residential Building, Feb 2001 - Australian Greenhouse Office/HIA joint publications

"In hot climates, the R value of bulk insulation directly under roof cover may be reduced by up to 40% of the advertised value. Detailed analysis should be undertaken to ensure that the required R value can be acheived and maintained"

Accordingly, for narrow ceiling/cthedral cavities, consider using foil sarking plus 2 FOIL BATTS producing approximately R4 summer / R2.5 winter, or foil sarking/airspace plus styrene board.

Dust on upward foil surfaces has no effect on summer or winter thermal performance if downward airspaces are maintained. Roll foil laid on ceilings would only function if a clear downward airspace exists - if directly in contact with ceilings or existing insulation, the foil upward summer reflective surface can slowly degrade by dust accumulation while the downward foil surface is totally ineffective due to conduction. NB: dust on FOIL BATTS will settle mostly in the concertina valleys.

FOR NON-STAPLING FOIL BATTS IN FLAT CEILINGS

* Ceiling area + 1/3 to allow for more material needed to create well formed triangular airspaces.
* Divided by pack area
= Number of packs

Between Ceiling Joists (parallel placement and maintaining visibility of timbers)
a) laid over existing fibrous insulation - no stapling to joists, placement only
b) laid directly on ceiling.
* 450 centres = use 1 1350x600 size
* 600 centres = use 2 1350x450 size (with 2 central concertina overlaps)
* 600 centres = use 1 1/3 1350x600 size per spacing (ie. cut FOIL BATT lengthways into 3 equal amounts)
* 900 centres = use 2 1350x600 size (with 1 central concertina overlap)

Covering Ceiling Joists
a) lay FOIL BATTS across joists and existing fibrous insulation - use 1350x600 size
b) 2 FOIL BATTS between joists, second layer criss-crossed across top of joists