Emma Wilson
Mushroom fixings are used for securing plasterboard slabs to walls and ceilings. They are made of plastic or metal and are designed to be used with an adhesive. The recommended number of mushroom fixings per 8x4 sheet ranges from 6 to 18, with 12 being the most commonly recommended amount. These fixings are also available in different sizes and lengths, such as 8mm x 110mm, and come in boxes of 50 or 250.
| Characteristics | Values |
|---|---|
| Number of mushroom fixings per 8 x 4 sheet | 6-12, with one source recommending 18 |
| Number of mushroom fixings per box | 50 or 250 |
| Mushroom fixings compatibility | Mineral wools, glass wools, building slabs, PIR, Phenolic, insulated plasterboard |
| Mushroom fixings material | Metal, stainless steel, plastic |
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What You'll Learn
Recommended number: 12-18 fixings per board
When it comes to insulating walls, the recommended number of mushroom fixings per slab is 12-18. This range ensures a secure and stable installation. While some sources suggest that as few as 3 or 6 fixings may suffice, 12 is generally considered the minimum for an 8 x 4 sheet of insulated plasterboard.
Mushroom fixings are plastic fittings that resemble mushrooms and are used to attach plasterboard to walls and ceilings. They are designed to be sunk into the plaster and finished flush with the surface. The number of fixings required can vary depending on the size and weight of the plasterboard, as well as the specific application and personal preference.
For example, when insulating a kitchen, one person used 18 fixings per board, as recommended by Kingspan. However, they noted that this seemed excessive, and other sources suggest that 12 fixings are sufficient. In some cases, people have used as few as 6 fixings per board, but this may not provide the same level of security.
It's important to note that the fixings will be more noticeable than screws or nails, so it's essential to use enough fixings to ensure a secure installation without overdoing it. Additionally, the depth of the mushroom fixings should match the depth of the plasterboard for the best results.
When installing mushroom fixings, it's also recommended to use a bonding adhesive or compound, such as gyproc compound adhesive or gypsum bonding compound with PVA, to ensure a strong and secure hold. This combination of fixings and adhesive provides an effective way to attach plasterboard slabs to walls and ceilings. However, it's crucial to follow the manufacturer's instructions and take the necessary precautions to ensure a proper and safe installation.
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Installation: Drill, hammer, skim
To install mushroom fixings, you will need to drill and hammer them into the wall. Here is a step-by-step guide:
Step 1: Prepare the Wall
Before installing the mushroom fixings, prepare the wall by cleaning and levelling the surface. Make sure the wall is free of any debris or loose material that might interfere with the installation. If you are working with an existing wall, you may need to remove old fixings or smooth uneven areas.
Step 2: Determine the Number of Fixings
The number of mushroom fixings required per slab depends on the size and weight of the slab and the specific product you are using. For an 8x4 sheet of insulated plasterboard, recommendations range from 6 to 18 fixings per board. It is important to follow the manufacturer's instructions and industry standards to ensure a secure installation.
Step 3: Drilling
Using a drill, create holes in the wall at the marked locations. The holes should be slightly smaller than the diameter of the mushroom fixings. A common size mentioned is an 8mm drill bit for mushroom fixings. Drill the holes to a depth that accommodates the length of the fixings, ensuring a secure grip.
Step 4: Inserting the Fixings
Take a mushroom fixing and insert it into each drilled hole. Use a hammer to drive the fixing into the hole until it is firmly in place. Be careful not to hammer with excessive force, as this may damage the fixing or the surrounding wall. A light tap with a hammer should be sufficient.
Step 5: Recessing the Heads (Optional)
To achieve a smooth finish, you may want to recess the heads of the mushroom fixings slightly below the surface of the wall. This can be done by gently tapping the heads with a suitable tool, such as a piece of a brush handle, until they are just below the surface. Be cautious to avoid hammering too deeply, as this may affect the stability of the fixing.
Step 6: Skimming
Once the mushroom fixings are securely in place, you can apply a skim coat of plaster over the wall to create a smooth and even surface. This step may not be necessary depending on the intended finish and the other materials being used. Follow standard plastering techniques and allow the plaster to dry completely before proceeding with any additional work.
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Use with adhesive? Yes
When using mushroom fixings with adhesive, it is recommended to use about 3 fixings per board. However, the number of fixings can vary depending on the specific requirements and recommendations of the manufacturer. For instance, Kingspan recommends using 18 fixings per board for 63mm insulated plasterboard, while others suggest using anywhere between 6 to 12 fixings per board.
To install mushroom fixings with adhesive, you will need to drill through the plasterboard and into the wall. The top of the fixing should be about 3/4 inch in diameter, and you will need to use an 8mm drill bit. After drilling, hammer in the fixing through the hole. It is important to ensure that the fixing is secure and does not move, especially around the joints. Some people also recommend scrim taping the heads and joints for added security.
When using adhesive with mushroom fixings, it is important to use the correct type of adhesive. A gypsum bonding compound with PVA is recommended, as ordinary bonding adhesive may not bond well with insulated boards. The adhesive should be applied in dabs or dots to the wall, and then the plasterboard slab can be secured to it.
It is worth noting that some people prefer to use screws or nails instead of adhesive for a more secure and permanent fixing. This method involves screwing or nailing the plasterboard directly to the ceiling or wall, rather than using adhesive to attach it. This may be a better option if you are looking for a longer-lasting solution, as adhesive may not provide the same level of strength and durability as mechanical fixings.
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Materials: Metal, steel, plastic
Metal, steel, and plastic mushroom fixings are used for secure insulation installations. They are designed with fire resistance in mind, making them ideal for installations where fire resistance is required. Each box typically contains 250 anchors, although smaller packs of 50 are also available. The fixings are compatible with a wide range of insulation materials, including mineral wools, glass wools, building slabs, PIR, Phenolic, and insulated plasterboard. They feature a tapered shaft that provides a snug fit, ensuring a secure installation. The heads of the fixings have strategically placed holes, providing an ideal surface for rendering. The generous diameter of the head offers excellent support for insulation material, preventing accidental damage.
When using mushroom fixings, it is important to consider the number of fixings required per board or sheet. Recommendations range from 6 to 18 fixings per board, with 12 fixings per board being a commonly suggested amount. The number of fixings may depend on the specific requirements of the project and the type of board being used. For example, Kingspan recommends using 18 fixings per board for their 63mm insulated plasterboard.
It is also important to consider the installation process and how to properly recess the fixings. When hammering the heads of the fixings, it is recommended to get them slightly below the surface of the board. This can be achieved with care and practice, and using a piece of a brush handle can help recess the perimeter of the head. Any hairline cracks where the fill plaster meets the board can be filled with two coats of paint or caulking.
Additionally, when working with vinyl wallpaper, it is recommended to score the paper if dabbing or try to remove the top layer. This is to ensure that the slab is secure and does not allow movement. While some sources suggest that paint can disguise hairline cracks, others advise against solely relying on paint to cover up imperfections.
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Compatibility: Insulated plasterboard, solid and hollow building materials
Mushroom fixings are used to secure insulation installations. They are compatible with a wide range of insulation materials, including mineral wools, glass wools, building slabs, PIR, Phenolic, and
The number of mushroom fixings required per slab depends on the size and type of slab, as well as the specific application and installation method. For an 8 x 4 sheet of insulated plasterboard, recommendations range from 6 to 18 fixings per board. Some sources suggest using 3 fixings per board, while others recommend 12 fixings per board. It is important to follow the manufacturer's instructions and guidelines for the specific product being used.
When installing mushroom fixings, it is important to ensure that the fixings are recessed slightly below the surface of the slab to create a smooth finish. This can be achieved by hammering the heads of the fixings until they are just below the surface. Any hairline cracks or imperfections can then be filled with plaster or caulking and covered with paint for a seamless finish.
In addition to the fixings themselves, adhesive mixtures and bonding compounds may also be used to secure the slabs to the walls or ceilings. The type of adhesive or compound used will depend on the specific application and the recommendations of the manufacturer. It is important to note that bonding adhesive may not be effective on insulated boards, as it may not bond properly with the insulation.
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Frequently asked questions
It is recommended to use 12 mushroom fixings per 8 x 4 sheet. However, some people suggest using anywhere from 3 to 18 fixings per board.
Mushroom fixings are used for attaching insulated plasterboard to walls and ceilings. They are made of plastic and look like large thumb tacks.
To install mushroom fixings, you need to drill through the plasterboard and into the wall, then hammer in the fixing through the hole.
The recommended size drill bit for mushroom fixings is 8mm.
Yes, mushroom fixings can be used with adhesive. However, some people recommend using a combination of fixings and compound for a stronger hold.
