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There is always the threat of
fire affecting a thatched roof and because of this
Thatching Advisory Services Ltd. has, over the years,
developed and sold products that can reduce this risk
in both existing roofs and on new build thatch. The
use of these products can also, in some cases, allow
the thatching of a new extension that would normally
not gain permision from building control.
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TAS Thatchsayf
is an environmentally safe and effective fire retardant coating
for the fire protection of thatch roofs. On exposure to heat,
the fire retardant forms a protective char that restricts oxygen
flow to the surface and reduces the surface temperature of the
coated base
TAS Thatchsayf is
a water-based solution of fire-retardant and intumescent chemicals
in a polymer emulsion binder formulated for the protection of
thatch roofing. This combination provides dual protection with
the fire retardant chemicals penetrating the leaves of the thatch
and the intumescent, as well as some of the fire retardant chemicals,
forming a thin protective film on the surface of the thatch stems
TAS Thatchsayf
does not change the natural appearance of the thatch and improves
compaction without hindering its abilit y
to breathe. TAS Thatchsayf also retards bacterial and fungal growth.
In order to minimise water penetration it is crucial that roof
slopes are 45 degrees
The main constituents of TAS Thatchsayf
consist of fertiliser type chemicals, i.e. phosphates and nitrogen
compounds, and as such are environmentally friendly, however,
high concentrations, such as may be reached in the run-off water
after the first rain, may cause damage to vegetation in the drip-off
area depending on the amount of rain and thus the dilution
Click on the link below to see details of this product and contact
us for an up to date price.
Thatch firewall developed jointly between Rentokil and TAS Ltd
was manufactured to specifications as recommended by Building
Control.
This product provides one hour fire barrier (B.S. 476: Part 3
2004) Classification EXT.S.AC. Fixed between the thatch and roof
construction. In the event of a thatch fire, the thatch is sacrificial
and untreated.
Application
Thatch Firewall is laid horizontally across the rafters, similar
to roofing felt with a 50mm/75mm overlap. Thatch Firewall can
be either stapled or nailed to rafters. Then counter batten over
the rafters with 25mm x 50mm to allow for airflow. Finally fix
first batten 5" from arris rail followed by 12 inch centres
thereafter.
Benefits
1 hour fire barrier (B.S. 476. Part 3 2004)
Easy application
Water resistant
Strong and durable
Breathable
Standards and Approvals
Thatch Firewall, flexible partition which forms the fire barrier,
provides effective compartmentation against the spread of fire
The Firewall (LFB60) is a lightweight glass fibre fabric coated
both sides with a polyurethane polymer containing micronised aluminium.
It's silver-grey in colour and to weigh 490g/m²
Test Report
Dimensions
Supplied in 50m x 1.27m rolls, which covers approximately 61
sq. metre (660 sq. ft) including overlap (50mm).
Supply
Thatch Firewall is available exclusively through the Thatching
Advisory Services Ltd, Andover who are part of the NFU mutual
or through Master Thatchers (its network of franchise thatchers
distributed throughout the UK). A list of franchisees is available
on request.
Introduction
Thatchbatts are non-combustible high quality resin bonded lightweight
Rockwool slabs, designed to provide fire protection to the underside
of thatched roofs on new buildings and/or extensions to existing
buildings. They will also provide thermal and acoustic insulation.
Application
Thatchbatts are fitted between the rafters, supported from galvanised
steel brackets as illustrated.
The fixing sequence is as follows:
- Ensure correct sized bracket is selected, i.e. for 400 or
600mm centre rafters.
- Secure the brackets to the rafters with galvanised nails
at 300mm centres, starting 150mm from the eaves. Ensure 150mm
dimension is also maintained at the ridge, if exceeded fit an
additional bracket.
- Starting at the eaves, make a mitre cut in the first batt
for wall plate/soffit and install the first layer of Thatchbatts,
ensuring a good fit between the rafters. A mitre cut should
also be made in the batt at the ridge. Part batts, e.g. 300-600mm
length, should be supported on at least two brackets.
- Install the second layer of Thatchbatts. Horizontal joints
must be staggered with the first layer.
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Secure the second layer of aluminium foil over the Thatchbatts
with a minimum 50mm lap on the horizontal joints.
-
Secure battens over rafters for thatch as
standard instruction.
Standards and Approvals
- During a fire demonstration carried out on two identically
constructed thatched roofs (one insulated with two layers of
Thatchbatt, one without), the insulated house provided up to
1 hour fire protection to the underside of the thatch. An official
report on the test has been prepared by the Loss Prevention
Council, ref. CC10647, a copy is available on request.
- The installation of 100mm of Thatchbatts with a standard 300mm
thatched roof significantly improve the thermal (U value) of
the roof and will meet the requirements of the new 1990 Building
Regulations.
- Dispensations to the 12 metre rule regarding new build thatch,
and extensions to existing thatch, have been obtained using
Thatchbatts.
Dimensions
1200 x 400 x 50 mm (400crs Rafters)
14 pieces per pack (6.72m2 at 100mm thickness)
Supply
Thatchbatts are available exclusively through the Thatching Advisory
Services Limited or through Master Thatchers (its network of franchise
thatchers distributed throughout the UK). A list of franchisees
is available on request.
The galvanised support brackets and aluminium foil are also available
through the same suppliers.
Handling and Storage
Thatchbatts are very light, and easy to cut to any shape with
a sharp knife. They are compression wrapped in polythene for short
term protection. For long term protection they should be stored
indoors or under waterproof covering.
Further information, help and advice on this product and its
application, is available from:
Thatching Advisory Services Ltd
The Old Stables
Redenham Park Farm
Redenham
Andover
Hampshire
SP11 9AQ
Tel: +44 (0)1264 773820 Fax: +44 (0)1264 773836
Click
Here To E-mail Us
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