Insulation Services | Menai Heating LTD

Loft insulation is a type of insulation that is installed in the attic or loft of a building to prevent heat loss through the roof.
The insulation used is rock wool.
The insulation is placed on top of the attic floor, between the joists, and then put horizontally across the first layer of insulation
It is also important to ensure that there is proper ventilation in the attic to prevent moisture build-up and mould growth.
We will tend to install anywhere up to 400mm of the insulation. Size depends on what's currently up there. We aim to have 400mm insulation up there after any work is done Tanks, pipes and wires may need lagging or insulating also.

Pre requirements

Existing loft insulation to be under 200mm
Low energy rating (E, F, G)
No protected species in loft
No hazard species e.g. Wasps in the loft
To have a non-fixed form of access e.g.ladder
Ventilation as per pas 2035 guidance

Dwellings that qualify

Stone built dwellings
System built dwellings
Timber frame dwellings
Solid brick dwellings
Cavity built dwellings

Common questions

1) Can I keep my loft boarded?
If additional insulation is desired, you will either need to remove the boards then re-install them once we have installed the loft insulation, let us install on topof the boards or we can attempt to try and install the right amount of insulation underneath the existing boards.

2) Does it come with a guarantee?
Loft insulation comes with a two-year guarantee.

The material used to install cavity wall insulation is called Therma beads.
Therma beads are small polystyrene like beads that are pumped inside the cavity between the inner and outer bricks of a cavity-built house

Theinstall process of cavity wall insulation consists of:

Holes are drilled on the external elevations of the dwelling (about the size of a 10p piece).
The material is then injected into these holes under pressure.
The material will be injected and completely fill the whole cavity (space between inner and outer bricks).
The holes are then patched up.

Pre requirements

To be cavity built
To have no existing issues of any type of damp or water ingress
To have a DPC
To have a secure DPC
To have a low energy rating (E, F, G)
Ventilation as per pas 2035 guidance

Dwellings that qualify

Cavity built dwellings with empty cavities
Cavity built extensions with empty cavities

Common questions

1) Does it come with a guarantee
The cavity wall insulation comes with a 25-year CIGA guarantee

2) Is it safe to install?
As long as there are no pre-existing issues with the walls, cavity wall insulation installed correctly will not cause any issues.

3) Will it cause damp or mould?
Properly installed cavity wall insulation will not cause damp or mould. However, if your building already has a damp or mould problem, it is important to address this issue before installing insulation.

4) I've heard horror stories about CWI, will this happento me?
Generally, the horror stories you here about are caused by the old-style cavity wall insulation which has a similar texture to loft insulation. If any water was to get in the cavity, the insulation would absorb any moisture and bridge the moisture and cause damp issues internally.

5) Will your material cause damp issues?
Therma beads do not have any sort of absorption properties. If any water was to get into the cavity, it would drain through the bead to the bottom of the cavity, just as if the Therma beads were not there.

Room in roof insulation consists of insulating the top storey of a building that has over 50% of its dwarf walls under 1.8m. Room in roof insulation consists of insulating the slopes, dwarf walls, gable ends, party walls, flat ceilings and residual spaces of a qualifying room in roof.
The insulation system used the SWIP room in roof system.
All external elements of the room in roof must be insulated apart from the external elements in wet rooms.
Due to the impracticability of trying to insulate wet rooms, they do not get insulated. However, we must then install DMEV fans into wet rooms and prove we can heat the room to 18C when occupied.

The install process of the room in roof insulation system consist of:

Insulated plasterboards are fixed to the rafters on any slopes of the room in roof and then plastered over.
The SWIP internal wall insulation system is installed to all gables walls and party walls.
When the dwarf wall element is a timber wall, Rock wall is fixed to the backside of the studwork in netting.
When the dwarf wall element is a masonry wall, the SWIP IWI system is used to insulate the wall.
The flat ceiling of a room in roof will get rock wool insulation placed inside the flat ceiling area if there is enough crawl space.
The flat ceiling will be over boarded with insulated plasterboard if there is not enough crawl space and then plastered
The residual space floors will have rock wool insulation installed in-between the joists if residuals are present.
Any woodwork removed will be replaced (only skirting boards and window-cills) and any plumbing or electrical fixtures will be made good.

Pre requirements

No signs of excessive damp or mould
No signs of any structural movement e.g. subsidence
Low energy rating (E, F, G)
Ventilation as per pas 2035 guidance
For the proposed room in roof dwarf walls to be under 1.8mfor 50% of the dwarf walls
To have a fixed staircase up to the room in roof

Dwellings that qualify

Stone built dwellings
System built dwellings
Timber frame dwellings
Solid brick dwellings
Cavity built dwellings

Common questions

1) What is the insulation thickness?
No signs of any structural movement e.g. subsidence
100mm on gable walls or party walls, 100mm on masonry dwarf walls, 300mm on studwork dwarf walls, 67mm on the slopes, 300mm in flat ceiling if accessible, 67mm if the flat roof is inaccessible and 300mm in residual crawl space

2) What's included?
We will take any of the treated walls up to a plastered finish. Anything that has been removed e.g. skirting boards, window cills, electrics, plumbing. Will be re installed or replaced. Covings will not be replaced generally, and window cills will be replaced with MDF Cills only.

3) What if I don't want one room done?
All habitable rooms of a dwelling must be insulated. The only rooms that are exempt are wet rooms.

4) Does it come with a guarantee?
Room in roof insulation comes with a 25-year quality mark guarantee.

Internal wall insulation is an insulation system that consist of insulating all external walls of a dwelling, internally.
All external wall of a dwelling must be insulated with the SWIP system apart from the external walls in wet rooms (kitchens, bathrooms, utility rooms and WC's).
Due to the impracticability of trying to insulate wet rooms, they do not get insulated. However, we must then install DMEV fans into wet rooms and prove we can heat the room to 18c occupied.

The install process of the SWIP internal wall insulation system consist of:

Fixing Insulated battens to the inside of the external wall.
Installing a Glass mineral wool insulation slab in-between the insulated battens.
Securing a Vapour control barrier across insulation and battens.
Laying Plasterboard on top of vapour control barrier.
Providing a plastered finish to the plasterboard wall.
Installing any required wood work to treated walls.

Pre requirements

No signs of excessive damp or mould
No signs of any structural movement e.g. subsidence
To be solid build
Low energy rating (E, F, G)
Ventilation as per pas 2035 guidance

Dwellings that qualify

Stone built dwellings
System built dwellings
Timber frame dwellings
Solid brick dwellings

Common questions

1) What is the thickness of the insulation?
The finished product takes approximately 100mm off the wall. In some instances, we can thin the insulation down where the thick insulation may cause issues e.g. When opening and shutting doors.

2) What's included?
We will take any of the treated walls up to a plastered finish. Anything that has been removed e.g. Skirting boards, window cills, electrics and plumbing. Will be re installed or replaced. Covings will not be replaced generally, and window cills will be replaced with MDF Cills only.

3) What if I don't want one room done?
All habitable rooms of a dwelling must be insulated. The only rooms that are exempt are wet rooms.

4) Does it come with a guarantee?
The internal wall insulation comes with a 25-year quality mark protection guarantee.

Underfloor insulation is installed when there is enough space under the suspended floor for an installer to access with the insulation.
Insulation is installed between the floor joists and is secured in place in netting that is secured to the joists.