Timbercoat Intumescent Paint Basecoat

Extra info 2

Half Hour and 1–Hour Resistance To Wood
In line with good common practice, we recommend that approval be sought for the use of our system, outlining
our justification for the issuing of the Fire Certificate prior to the product’s use.
Authorities generally accept our Fire Test evidence as justification for the provision of One Hour Fire Resistance in
cases such as this for up to 1 Hour Fire Resistance, depending upon the thickness of board in question.
We hold independent Fire Tests for Thermoguard Timbercoat to provide One Hour Fire Resistance to a mock–up
of a ceiling comprising softwood timber boards on softwood joists, with the boards abutting one another and
joined by metal tongues set into the abutting edges of the boards. Whilst the amount of residual undamaged
timber was clearly adequate to have withstood office or accommodation design loads, the floor tested in the Fire
Test did not have weight imparted to it, as we sought data to work from the test for sites with greatly differing
make–ups.
The floor tested achieved One Hour Fire Resistance to BS 476 Part 22, with approximately 7mm of timber joist
and board surfaces destroyed to charring during the test. Charring was greater up the open joints between
floorboards, reaching 12mm, as one would expect being merely butt–jointed rather than tongue and groove
jointed. Provided the calculated residual structure is adequate, we also issue Certification to BS 476 Part 21 to 30
or 60 min Fire Resistance. The normal char factor of unprotected softwood for 60 minutes is approx 50mm, thus
additional Fire Resistance provided by our Intumescent Paint was approx. 30 minutes.
A Fire Resistance test for 30 mins was carried at Warrington Fire Research Centre in January 2016 to 25 mm
softwood and 25 mm MDF . Uncoated boards burnt through completely during the test .
Application at 300 microns wet (12 sq m per 5 kg ) resulted in loss to char of 7mm on softwood , 5 mm on MDF
Application at 500 microns wet ( 8 sq m per 5 kg ) resulted in loss to char of 3mm on softwood , 2 mm on MDF
Thermoguard Timbercoat was filmed by Chanel 5 for documentary “Megastructures – Building from Distaster”
which recorded 20 in simultaneous parallel test to 18mm softwood that at 6 mins uncoated board burnt through,
while boards protected with Timbercoat @ 600 microns / 7 sq m per 5 kg lost only 3 mm to char at 45 mins , with
the protected board retaining insulation so that it was safe to put hand on reverse face while burner continued
on the front face.
30 mins + BS EN Class B s1 dO and Class O
(1) 10 mm thick board —
apply 3 coats Thermoguard Timbercoat/ @ 20 sq m per 5 kg per coat or 4 coats @28 sq mtrs per 5kg
OR (2) 15 mm thick board
2 coats Thermoguard Timbercoat @ 20 sq m per 5 kg per coat or
3 @ coats @ 30 sq m per 5 kg per coat
OR (3) 18 mm thick board
2 thick coats Timbercoat @ 22 sq m per 5 kg each or 3 @ 33 sq m per 5kg
OR (4) 22+ mm thick board
2 coats Timbercoat @ 24 sq m per 5 kg per coat or 3 @ 36 sq m per 5 kg
PLUS (to any of the above ) –
Internal 1 coat Thermoguard Smoke & Flame Retardant “SFR” Dualcoat Eggshell or Matt
External 2 coats thermoguard SFR Dualcoat eggshell or matt
60 mins + BS EN Class B s1 dO and Class O
(1) 20 + mm thick board —
apply 3 coats Thermoguard Timbercoat/ @ 20 sq m per 5 kg per coat or 4 coats @28 sq mtrs per 5kg
Plus — Internal 1 coat Thermoguard Smoke & Flame Retardant “SFR” Dualcoat Eggshell or Matt
Or External 2 coats Thermoguard SFR Dualcoat eggshell or matt