Insulation Of External Walls | Installation

In the case of Insulation Of External Walls, Fixing of the cavity wall and the ever-growing variety of wall ties has been resolved The problems of water penetration of the walls did nothing to improve the heat Cavity wall performance – This is better than a brick solid wall.

Initial efforts focused on the use of lightweight concrete or oaks for making blocks that were only used for the inner leaf. These are not enough to meet today’s high standards
But can be used in conjunction with layers of insulation material.

We look at how they can contribute when looking at U-value calculations. Insulation materials can be placed in one or more of the three cavity walls as shown in Figure 3.8:

1. On the outer face
2. On the inner face
3. In the cavity
4. Filling the cavity Partial filling of the cavity (always on the inner leaf).

Insulation can be placed in the cavity as the wall is built, or it can be pierced or blown
Into the ventricle. Insulation into the cavity is checked shortly afterward, as it is usually an exercise on an existing wall.

Insulation applied to the outside of the wall is usually done as part of the renovation
Existing structure. This includes special fixings and a new weatherproof finish. These systems are not reviewed in detail in this text.

Walls and sections 85 One, for example, uses a composite layer of insulation: perforated building paper, stainless steel mesh, and two-coat render. Insulation is a polystyrene beadboard, which is attached to a building paper layer with 3 vertical slots and woven with stainless steel wire mesh through the slots.

This first layer is consistent with a fastener that does not differ from the stone wall.
Framing anchor with large plastic washer (see Appendix G). Once corrected, a two-coat cement/lime render is applied, which effectively seals the weather-proof layer.

This leaves the study of injection systems built into the cavity or built inside The face of a wall.

Available items:

1. Glass fiber
2. Mineral wool
3. Foamed Plastics: Like a polystyrene beadboard or loose beads
4. Extracted polystyrene
5. Urea-formaldehyde foams
6. Phenol formaldehyde foams
7. Polyurethane foams.

Glass and mineral wool materials include glass or mineral wool fibers. Quilt or mat, a slab or bat, each with different ranges or densities. The fibers are coated with Resin-based glue; The lighter the product, the less adhesive is used.

System of insulation of external wall:

Quilts are available in rolls, usually 1200 wide, and can be split into 2 × 600 mm or 3 × 400 mm inside the pack, which fits standard stud centers. Quilts can be supplied on one or both sides of a ‘plain’ or ‘paper cover’.

‘Papers’ can be simple, bitumen bound, foil-faced, etc. Bats are supplied as flat sheets of various sizes and densities. High-density bats have good load-bearing characteristics but poor thermal performance.

To be built into the cavity the lower 3 building paper is specially formulated to resist the passage of ‘solid’ water but allows the passage of water vapor. Resistance to the passage of solid water is only effective in the long run if the object is a ‘wet’ face It is left unopened, which means it cannot be pressed against a damp inner leaf.

It has a density, high thermal performance, and a width of 440mm – six courses, which is usually the vertical distance between the wall ties. Those bats designed to fill the cavity have fibers attached to the width to help drain any ‘solid’ water that penetrates the outer leaf.

Foamed polystyrene and polyurethane are supplied as sheet material, which can be
Applied to inner wall surfaces or as partial or full ventricular insulation. Different concentrations
Available

Extracted polystyrene is very rigid and has better thermal performance than the same density beadboard. Extracted Board Com- referred to as money blue board and it has good resistance to water vapor and is waterproof.

The beadboard is quite tough but much narrower than a board of the same density. It has some carrying capacity and is made of special grades And commonly used underfloor screeds and floating timber floors.

It is not waterproof and is very accessible to water vapor. It should be familiar to anyone who has unpacked a computer, TV, or white goods, its main use is in-mold packaging, although the grade used is more friable than insulation.

The polyurethane board is very friable and is usually faced with one or both sides
With bituminous felts, foils, and papers. It is a bit more expensive than polystyrene
It has a high thermal resistance that goes out of the foaming process.

when first manufactured The pores are made up of carbon dioxide rather than air In the ‘clean’ cavity, the foam seals around the shank of the wall tie. If there are mortar droppings the foam will not form a seal, and water is concentrated at these weak points and penetrates the foam and the inner leaf.

This can occur even if the unfilled cavity had not shown signs of being bridged before injecting the foam, Walls and Partitions 87 this framework, a quilt or batt of glass or mineral wool can be placed and the whole covered with a suitable sheet material – generally plasterboard.

To prevent hot moist air from the room penetrating to the cold wall face, condensing and causing rot, etc., a layer of polythene sheet is placed between the plasterboard and the strapping. The layer is known as a vapor barrier, vapor check, or vapor control layer.

A vapor barrier is too definite a term – it is impossible under construction site conditions to put up a vapor barrier. At best one can control or check – as in delay or reduce – the flow of moisture through the layer.

Check is indefinite in meaning, so a vapor control layer would be the best option. Figure 3.10 illustrates the wall strapping technique. Vapor control layers will be the subject of a more detailed discussion as they occur in various other parts of the construction process.

Using loose foamed polystyrene beads is an effective way of filling a cavity with insulation,
generally as a retrofit or upgrading exercise. Holes are drilled through the masonry joints and beads are blown into the cavity through a fairly large nozzle.

At the nozzle, another smaller pipe injects an adhesive into the stream of beads. Once the adhesive has been set, any cutting of holes through the wall in the future does not result in all the beads running out and having to be replaced.

Because the insulation formed has a very open texture, water penetrating the outer leaf drains down and does not cross the cavity. Again, wall ties must be clean to prevent water crossing at the ties.

Another ‘injected’ insulation technique is to blow mineral wool fibers into the cavity
Through holes drilled in the outer leaf. The holes should be larger than used
For the injection of foam and after completion it becomes more difficult to disguise.

The most worrying factor in the early development of the technique is practice
The fibers descend to the bottom of the cavity after some time. It was quite natural
The process of transferring excess air between the fibers from the upper fibers.

This effect can be exaggerated if there is traffic or vibration caused by residents,
And even worse if the fibers are wet because of the rain that penetrates the outer leaf. Both were overcome by adding a waterproof adhesive to the fleece during the injection.

After the adhesive set, the wool maintained its loft, and its open design allowed it to drain water rather than pass through the cavity. Placing insulation on the inner face
The wall can be made in several ways.

Traditionally, thin wood or strapping is attached vertically to the inside of the wall in the centers. Further trees are arranged horizontally across the top and bottom of the wall, as well as Short long strapping (noggings) in two or three rows between verticals.

In more modern practice, plasterboard, plywood, fiberboard, etc., use a plastic foam sheet laminate on the finishing board. This material is applied directly to the inside of the wall and is repaired using adhesives that fill the gap.

The use of a vapor barrier under the finishing board is generally not necessary as the foam plastic sheet is sufficiently moisture resistant. Simple precautions with sealing mastic can be used in joints. If a very positive moisture seal is required, it is possible to have a laminate made of polyethylene or foil layer between the foam and the board.

Discount the joints of the boards and the two layers of film or The foil can be sealed together. This is illustrated in Figure 3.11. The adhesives used are usually based on gypsum plaster and can be modified By adding a binding agent.

Sheets have bonded insulation to the plasterboard so that the insulation forms on the two adjacent edges and the board on the other two adjacent edges. The vapor control layer covers all exposed faces in the joint area and can therefore be sealed together.

Due to their friable nature, urethane foam boards are not suitable for laminating
Attachment to a sheet finish or subbase. Polystyrene foam is high for this reason
General.

Also, Read:

1. Traditional Roofs
2. Types Of Wall