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We are a family business specialising in the application of sprayed polyurethane foam for insulation, stabilisation and soundproofing in domestic houses, agricultural, commercial, industrial buildings & boats. We have been operating continuously since 1984. Over this period we have built up a reputation for supplying quality materials and workmanship.
Unlike many companies offering under-tile foam spraying, we do not advertise in the Sunday papers and do not have glossy brochures - both of which you have to pay for. We do not employ salesmen, who are under pressure to sell the product to you, irrespective of whether it is appropriate in your particular circumstances. We do not employ subcontractors to do the work, your installation will be carried out by our directly employed staff James and Jon.
In order to keep costs to a minimum, we ask you to give us the approximate dimensions of your loft (outside dimensions of the house will do) and an idea of the height from the top of the ceiling joists to the ridge (highest point) of the roof, to enable us to work out the areas involved and give you an estimate of the cost subject to survey.
As long as this estimate is affordable, we will then carry out a survey to confirm the price and extent of the works.
If you are unable to give us the measurements upon which to base an estimate then we will carry out a survey at an earlier stage without obligation.
We encourage you, where necessary, to employ local contractors to ensure that your roof is externally watertight. This allows us to concentrate upon our area of expertise, the internal Sprayfoam installation, more competitively.
Polyurethane foam correctly installed has an indefinite life since it is only degraded by U.V. radiation (sunlight). Now in our 20th year of operation, we have installed in excess of 1000 tonnes of sprayfoam for a variety of domestic, commercial, industrial, local authority and agricultural customers.
SUITABILITY
The system is appropriate in the following situations :-
Weathersealing of tiled or slated roofs with decayed or non-existent underfelt which are prone to wind driven water or snow ingress and freezing pipes & tanks.
Stabilisation of old tiled or slated roofs where the fixings have deteriorated, which would otherwise require complete removal of the roof covering (and often complete renewal, since up to 50% of old roof coverings may be damaged once disturbed). Please note: the roof covering can only be stabilised where it is accessible to be sprayed from underneath. Areas of roof with no loft void beneath them e.g. above rooms with sloping ceilings following the roofline or where the roof projects beyond the walls cannot normally be treated.
Insulation over loft spaces to be converted into living accommodation or dry and dust free storage. Sprayfoam is the only insulation material which, being bonded to the rafters and underside of the roof and offering significant resistance to the passage of water vapour can ensure that no condensation takes place on the underside of the cold roof surfaces.This means that ventilation of the roof structure above the insulation is not required as it is with board and quilt materials.
Sprayfoam is approximately twice as good as an insulation material as alternatives such as polystyrene, glassfibre or rockwool is often the only material which will provide the required degree of insulation within the available space between the roof covering and the underside of the rafters on to which the lining will be fixed. Current building regulations require nearly 200mm(8") of rockwool or fibreglass in this situation with ventilation above, whereas less than 100mm(4") of Sprayfoam without ventilation requirement will achieve the same result within the depth of a 4" x 2" rafter.
MATERIAL
The polyurethane foam used has a class 1 fire rating to B.S. 476 part 7. Used in a conventional loft void it requires no further protection and is approved by most local authorities and building societies. Used when creating additional living accommodation, it should be further protected by underlining with plasterboard or plastered directly with a minimum 10mm finish / bonding plaster mix to give a non combustible surface finish providing ½ hour fire resistance.
PREPARATION
External
The application of sprayfoam will prevent wind blown ingress of water or snow by blocking the apertures through which the wind can blow but may only temporarily block up any direct leaks because the foam may be exposed to sunlight from outside which may degrade it. Consequently the roof covering must be essentially watertight. This means that externally any missing, damaged or slipped tiles/slates must be replaced or repositioned and any leadwork in roof valleys and flashings at chimneys or abutments must be sound.
Internal
The underside of the roof covering to be treated must be clean & dry. Any previous lining to the underside of the roof covering e.g. decayed underfelt or old plastering must be removed in order that the Sprayfoam can adhere properly to the roof covering and battens - locking them in place. Roofs with a straw underlining laid on top of the rafters present a problem since the straw is difficult to remove but unless it can be removed the roof cannot be treated.
Roof timbers
If the roof timbers are to be preservative treated, this work should be carried out at least a week in advance of the Sprayfoam installation to ensure adequate time for drying. Sprayfoam will adhere to the sides of the rafters stiffening the entire roof structure but will be omitted wherever possible from the underside of the rafters to allow the timber to breathe.
VENTILATION
The Building Regulations require cross ventilation at eaves level in normal loft voids to prevent warm moist air from within the house condensing when it reaches the cold loft void. If you require Sprayfoam for weathersealing or stabilisation of the roof covering only, then the existing ventilation arrangements should be maintained.
If you intend to convert your loft space into further accommodation then the existing ventilation arrangements will need to be altered. The existing eaves ventilation can be blocked off at eaves level by sealing from the roof surface onto the walls. This process, in combination with an adequate thickness of sprayed polyurethane insulation between the rafters will create a completely 'warm' roof construction which will eliminate any risk of condensation.
Alternatively, the existing cross ventilation at eaves level can be interrupted further from the eaves by constructing walls connecting the roof to the floor at any point. It should be remembered that such new walls will require insulation and draughtproofing to the same standard as the rest of the roof
INSTALLATION REQUIREMENTS
In order to carry out the work, the following are required :-
- A normal domestic power supply.
- Access to all parts of the loft to be treated of adequate dimensions to allow a man with equipment to pass. Access can normally be created if not in existence.
- Access for our vehicles, Mercedes 310 vans, to within 200 feet (hose length) of the furthest point of the loft to be sprayed.
- The loft void must be cleared of rubbish and stored items.
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