Fibotherm insulating blocks/
bricks 3.6N/mmto BS EN 771-3

Stowell Fibotherm blocks are ideal for…

  • inner or outer leaf of cavity walls
  • partition walls

Stowell Fibotherm blocks offer the following advantages…

  • High Insulation
  • Low Shrinkage
  • Low Site Breakage
  • Low Density
  • Good Fixing
  • Excellent Plaster Key
3.6N/mm2 (OVEN-DRY DENSITY approx 850 kg/m3)
Size
mm
nominal
approx
weight kg
no. per
tonne
multiples
of
no. per
pack
440 x 75 x 215 6.7 150 56 112
440 x 100 x 215 9.0 110 44 88
440 x 140 x 215 12.5 80 32 64
440 x 190 x 215 17.2 58 24 48
Coursing bricks
215 x 100 x 65 1.35 740 128 512
215 x 140 x 65 1.9 530 96 384
U-Value 0.17 Dense Concrete Block - option 1
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
50mm low emissivity cavity 0.640
50mm foil-faced partial fill PIR/PU board (λ0.022) 2.273
100mm Fibotherm 3.6N/mm2  (λ0.29) 0.345
15mm dabs 0.170
45mm phenolic insulation (λ0.020) 2.250
bonded to…
13mm plasterboard (λ0.21) 0.062
Inside resistance 0.130
Sum of resistances 5.999 m2K/W
Uncorrected U-value 0.167 W/m2K
Mortar correction 0.001
Air gap correction 0.002
Wall tie correction – Staifix HRT4-225 0.002
U-VALUE 0.172 W/m2K
U-Value 0.18 Dense Concrete Block - option 2
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
160mm high performance mineral wool (λ0.032) 5.000
100mm Fibotherm 3.6N/mm2 (λ0.29) 0.345
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.627 m2K/W
Uncorrected U-value 0.178 W/m2K
Mortar correction 0.001
Air gap correction 0.000
Wall tie correction – Ancon ST1-300 0.004
U-VALUE 0.183 W/m2K
U-Value 0.18 Dense Concrete Block - option 3
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
50mm low emissivity cavity 0.640
110mm foil-faced partial fill PIR/PU board (λ0.022) 5.000
100mm Fibotherm 3.6N/mm2 (λ0.29) 0.345
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.812 m2K/W
Uncorrected U-value 0.172 W/m2K
Mortar correction 0.001
Air gap correction 0.006
Wall tie correction – Ancon ST1-300 0.005
U-VALUE 0.184 W/m2K

THERMAL CONDUCTIVITY: λ*
0.29 W/mK @ 3% m/c (Inside skin)
0.32 W/mK @ 5% m/c (Outside skin)

THERMAL RESISTANCE:
SIZE mm m2K/W at: m2K/W at:
75 3%m/c 0.259 5%m/c 0.243
100 3%m/c 0.345 5%m/c 0.313
140 3%m/c 0.483 5%m/c 0.438
190 3%m/c 0.655 5%m/c 0.594
(m/c = moisture content)

WEIGHTED SOUND INSULATION Rw:**
40 dB 75mm single skin, 121kg/m2
41 dB 100mm single skin, 142kg/m2
43 dB 140mm single skin, 180kg/m2
45 dB 190mm single skin, 231kg/m2

FIRE RESISTANCE:***
75mm (single skin unplastered)
½hr @60% loading
100mm (single skin unplastered) 2 hrs
140mm (single skin unplastered) 3 hrs
190mm (single skin unplastered) 6 hrs

* Calculated from oven dry density
** Calculated using mass law curve – BS8233 (with 2 skins of dense plaster each 25kg/m2)
*** Calculated using table 14 BS5628-3 2005 and BSEN 1996-1-2


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All products are available ex works.
Prices on application.
Telephone our sales office for further information and quotations.