Construction Details – Junctions, Connections and Expansion Joints
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WALL AND CEILLING WITH SINGLE-LAYER WITH FERMACELL BOARDING Separate wall and ceiling connections Where Fermacell abuts other materials such as plaster, exposed concrete, masonry, steel or wood, care must be taken as each has a different differential movement rate (expansion and contraction with environmental changes). (1) Junctions with elastic/flexible sealing material. The back of the profile being fixed to the wall must be backed with an isolation strip (for fire and acoustic purposes). Any gaps can then be filled with a flexible sealant which has a permanent expansion of at least 20 %. Nominally the gap left should be a minimum of 3–5 mm. (2) Junctions using Fermacell Joint Filler. Fit studwork and isolation material. When fixing the boards to the studs, leave a 5–7 mm gap and fill with Fermacell Joint Filler. For fire resistance requirements: Use a fire rated isolation strip. Rockwool type material should be of a thickness ≤ 5 mm. (1) Junctions with sealing material (2) Junctions with Fermacell Joint Filler |
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CORNER & T-JUNCTION T-junctions with single or double-layer boarding, with C stud fixed to Fermacell Board. (1) Fermacell Boards 12.5 or 10 mm |
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CORNER & T-JUNCTION Corner connections with single or double-layer boarding. (1) Fermacell Boards 12.5 or 10 mm |
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CORNER & T-JUNCTION Wall T-junction with interrupted longitudinal flanking transmission and inner corner profile. (1) Fermacell Boards 12.5 or 10 mm |
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CURVED PARTITIONS Bending Fermacell Gypsum Fibreboards When preparing curved wall and ceiling structures using standard size 10 mm and 12.5 mm Fermacell Boards, there are three methods of application. These depend on the areas where the curved walls are to be used and the required radius. For a radius ≥ 4000 mm, use dry bending with stud spacing ≤ 300 mm. In this case, standard size boards are fixed lengthways on to the studs. For a radius between ≤ 4000 mm to ≥ 1000 mm, wet bending (locally, on site) is recommended; the stud centres should be ≤ 250 mm. The Fermacell Boards must be humidified/wetted over a period of about 10 hours, placed over pre-formed templates to the required radius. After drying, the Fermacell Boards will regain their original properties, but will be a curved board. |
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DOOR MOUNTINGS, FRAMES AND Door mountings, frames, glazing and wall openings Please refer to the Fermacell Data Sheet about door reinforcement recommendations. Frame fixing to steel studs with timber inserts (1) Fermacell (2) Header/footer track (3) Rockwool (4) C stud (5) Door frame (6) Wood stiffening |
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FIXING DOOR FRAMES TO 2 MM THICK DOOR REINFOREMENT KITS Door frame installation methods There are many different methods of fixing that can be used for securing door frames to/in Fermacell partitions and fire walls. These depend on the room height (wall height), door width, weight of the door leaf, including door furniture, etc. Please see the Fermacell datasheet regarding door frame reinforcement. The guidelines for different door support types are based on the following door weights as a guide. Double door and leaf and a half doors will always require additional support. ≤ 25 kg doors – Timber inserts are required up to 2.5m of the partition height. 25 kg – 50 kg doors – Timber inserts are required to the full partition height. An L bracket is required at the head of the timber support. 50 kg – 60 kg doors – Timber inserts are required to the full partition height. An L bracket is required at the head and the foot of the timber support. 60 kg + doors – Steel Door Reinforcement kit and timber insert. When boarding around doors and openings it is imperative that joints do not run vertically from corners. The boards should be cut to allow joints to sit above the door head and offset from the edge of the door/opening by > 200 mm. |
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