Fire stops in building components with fire compartments
Installation for building services can cause penetration in space-enclosing elements. Fire regulations define the requirements for the installations. Through appropriate measures, the space enclosure of the plane element must not be affected, but also a transmission of fire into the building element must be avoided over a sufficient period of time. Suitable products for this are available on the market.
Hilti firestops
Two specialists, one goal: Hilti, specialist for fire protection and fire sealing and Lignatur, specialist for ceiling systems, jointly develop practical system solutions for structural fire protection and thus simplify interfaces on the building site.
The choice of a suitable firestop to match the installation situation is a challenge that affect both, planners and specialist contractors. Below we show the jointly developed solutions - in pure timber construction.
Fire sealing with firestop blocks
The illustration on the right shows possible variants of installations with sealings using a firestop block from Hilti as a basis for planning. The specific design must be done by the respective technical planner, or if necessary by the technical fire protection planner. Applications include electrical installations as well as heating and drinking water pipes. This version offers a high level of planning flexibility.
Firestop block in LIGNATUR
For ceiling tests, the results of tests on sealings with a minimum length of 1000 mm apply to any length, as long as the ratio of circumference to area of the sealing is not smaller than that of the tested sealing (EN 1366-3:2009).
In LIGNATUR there was measured a firestop block sealing with a length of 1000 mm, therefore the following applies:
max. area of the penetration A: 400,000 mm2
max. circumference U: 2800 mm
Length x width = 1000 mm x 400 mm or 400 mm x 1000 mm respectively
If the penetration lies outside the cavity of the LIGNATUR element, a timber reveal ≥ 40 mm must be attached around the opening. It is limited by slats and possible counterforts in the cavities.
Doubling on LIGNATUR
If the required installation height of the fire protection product cannot be ensured due to the geometry of LIGNATUR, a doubling is attached locally around the penetration.
Required installation height of firestop block:
EI30: 130 mm
EI60: 130 mm - for LIGNATUR element EI60 ≥ 160 mm, no doubling necessary
EI90: 200 mm - for LIGNATUR element EI90 ≥ 200 mm, no doubling necessary
Joint design with firestop block over the element joint
Attachment of a strip of mineral wool in the area of the element joint above the tongue. For 90 minutes fire resistance, a vertical strip of mineral wool is additionally attached.
Fire sealing with firestop foam
The illustration shows an additional sealing variant with firestop foam from Hilti as a basis for planning. The specific design must be done by the respective technical planner, or if necessary by the technical fire protection planner. This version is somewhat more complex to execute on-site, but it offers a high level of planning flexibility.
Firestop foam in LIGNATUR
The maximum sealing size is 400 x 400 mm (l x w).
If the penetration lies outside the cavity of the LIGNATUR element, a timber reveal ≥ 40 mm must be attached around the opening. It is limited by slats and possible counterforts in the cavities.
For the assembly, a temporary shuttering board is attached that has to be removed again after the firestop foam has cured.
Doubling on LIGNATUR
If the required installation height of the fire protection product cannot be ensured due to the geometry of LIGNATUR, a doubling is attached locally around the penetration.
Required installation height of firestop block:
EI30: 150 mm
EI60: 150 mm - for LIGNATUR element EI60 ≥ 160 mm, no doubling necessary
EI90: 200 mm - for LIGNATUR element EI90 ≥ 200 mm, no doubling necessary
Fire sealing of single penetrations
The illustration on the right shows possible variants of single penetrations in combination with Hilti fire protection products as a basis for planning. The specific design must be done by the respective technical planner, or if necessary by the technical fire protection planner. Electrical sealings and conduit sealings for cables are implemented as well as heating and drinking water pipe sealings. If the precise planning is taken into account in advance, a faster and cheaper installation is achieved. The products are simple to install and thus guarantee high quality in the implementation.
Solid version LIGNATUR
If the lowest slat does not have a minimum thickness ti of 58 mm for EI30, 64 mm for EI60 or 100 mm for EI90, the cavity must be filled locally with C24 timber.
Electrical sealings in LIGNATUR with Hilti firestop cable collar CFS-CC
001 LIGNATUR element EI30 ≥ 120 mm
002 LIGNATUR element EI60 ≥ 160 mm
003 LIGNATUR element EI90 ≥ 200 mm
015 Hilti firestop cable collar CFS-CC, 150 mm x 50 mm
052 timber construction screw with part thread (TS)
For EI30 - TS: 6 x 60 mm, for EI60 - TS: 6 x 60 mm and for EI90 - TS: 6 x 80 mm
101 Installations according to Hilti applicability proof
Doubling on LIGNATUR
If the lowest slat does not have a minimum thickness ti of 58 mm for EI30, 64 mm for EI60 or 100 mm for EI90, the lower slat must be doubled with a wood-based panel.
Electrical sealings in LIGNATUR with Hilti firestop cable collar CFS-CC
001 LIGNATUR element EI30 ≥ 120 mm
002 LIGNATUR element EI60 ≥ 160 mm
003 LIGNATUR element EI90 ≥ 200 mm
015 Hilti firestop cable collar CFS-CC , 150 mm x 50 mm
052 timber construction screw with part thread (TS)
For EI30 - TS: 6 x 60 mm, for EI60 - TS: 6 x 60 mm and for EI90 - TS: 6 x 80 mm
101 Installations according to Hilti applicability proof
Fire sealing of single penetrations
Applications include single penetrations such as cables and conduits as well as fire protection socket boxes in LIGNATUR. Irrespective of the planned floor structure, the installations can be routed in LIGNATUR. The specific design must be done by the respective technical planner, or if necessary by the technical fire protection planner. This version offers a high level of flexibility.
Single penetration in LIGNATUR
Electrical sealing in LIGNATUR with f-tronic BS3700 fire protection socket box
If the lower slat has a thickness ti ≥ the max. clamping thickness of the retainer, an undercut ≤ 90 mm must be made to fasten the box. If EI90 is required, the cavity behind the box is filled locally with mineral wool.
001 LIGNATUR element EI30 ≥ 120 mm
002 LIGNATUR element EI60 ≥ 160 mm
003 LIGNATUR element EI90 ≥ 200 mm
059 f-tronic BS3700 fire protection socket box
101 Applications include flexible conduits ≤ Ø 25 mm, full, as well as power cables of the type A1 and A3.
Fire protection socket box in LIGNATUR
Electrical sealing in LIGNATUR with f-tronic BS3700 fire protection socket box
If the lower slat has a thickness ti ≥ the max. clamping thickness of the retainer, an undercut ≤ 90 mm must be made to fasten the box. If EI90 is required, the cavity behind the box is filled locally with mineral wool.
001 LIGNATUR element EI30 ≥ 120 mm
002 LIGNATUR element EI60 ≥ 160 mm
003 LIGNATUR element EI90 ≥ 200 mm
059 f-tronic BS3700 fire protection socket box
101 Applications include flexible conduits ≤ Ø 25 mm, full, as well as power cables of the type A1 and A3.
Exhaust systems
Measures to avoid the occurrence of fire through ignition of flammable elements with exhaust systems.
Construction example: installation shaft as a fire protection element for an exhaust system with negative pressure operation
1 connection pitched roof
2 connection flat roof
3 connection floor level
4 connection floor level above firing aggregate at connecting tube
5 connection floor level above firing aggregate
A external diameter exhaust system without fire resistance
B outer edge fire resistance element EI90
v external diameter connecting tube
x2 safety distance from outer edge of exposed exhaust system
The lower slat of the LIGNATUR element can reach up to the exhaust system if the distance demanded is x2 = 50 mm or less.
x3 safety distance from outer edge of exposed connecting tube with temperature class of exhaust system up to T400: x3 = 200 mm
a fire protection element AESTUVER, installation shaft AA EI90 (non-combustible) by Fermacell
b cavity insulation non-combustible
c constructive concrete ≥ 100 mm
d fire resistance board long-term heat resistant
d ≥ 18 mm (e.g. AESTUVER fire protection board d = 25 mm)
e firing aggregate
