Project Rock Wool Mortar to Thermally Insulate the Parking Roof

August 17, 2019

A few days ago I carried out the second part of the work necessary to achieve my purpose of improving both the thermal insulation of my house, and the fire resistance in case of fire in the parking area under my house until fulfilling the current regulations that require a minimum resistance to fire of the elements and slabs of 120 minutes (REI 120) and reduce the consumption of heating to save on the gas bill.

In mid-May, I carried out the first part of the work necessary to insulate my floor, blow rock wool into the air chamber of my floor, a floor on the 1st floor, corner with two winds facade on which the adjoining buildings cast a long shadow that does not let the sun go through all winter.

Diaterm Foc

So far we had completed some of the necessary steps to insulate my home and as a consequence, reduce the consumption of natural gas in winter, improving the energy efficiency of my house and with it, contribute my grain of sand to reduce the energy dependence that Europe has with some pseudodemocratic countries that export oil and natural gas.

Once this first part of the project was completed and before the arrival of the cold, another large radiant surface had to be insulated for which there were large temperature leaks.
Insulate the Roof of the Parking Projecting Rock Wool Cement

The second weak point of the thermal insulation of my apartment was the floor that is part of the same floor as the roof of the parking lot, a fully ventilated car park whose temperature is usually at most 2 degrees higher than the outside street temperature.

The ideal solution would have been to build a plasterboard ceiling with abundant rock wool, creating a plenum with sufficient insulation capacity. This option could not be contemplated due to the large number of passageways (downspouts, luminaires, electrical installation) that are visible in the lower part of the floor. The community was not willing to pay for the reparations of the false ceilings before a hypothetical water leak caused by the possible breakage of a downspout hidden behind a false ceiling.

Given this situation, the best option to solve my insulation problems was to use a projected mortar made of rock wool and cement. This solution has to significantly improve the insulation of the floor and, consequently, reduce the temperature loss due to thermal transmittance. For this we chose to project a rock wool mortar for fire insulation of structures such as Tecwool F, since with a minimum thickness of 20 mm. a REI120 was achieved in cross-linked floors.

To perform this type of insulation, a minimum of requirements are required to connect the pneumatic machine to be projected by the insulating mortar.
A water outlet close to which to connect the projection machine.
An electrical outlet of 230 volts and 40 amps, which will be responsible for feeding the electrical consumption of the pump.

First of all it is convenient to cover the floor before starting the application to reduce the collection work, despite being a very easy cleaning product.

Once the preparations prior to the application of the insulation have been made, it is necessary to apply a contact bridge (usually latex), this material will be in charge of improving the adhesion of the mortar to the surface to be insulated, avoiding the fall of coke during its application.

At this point, it is only necessary to project the parking slab with mortar projected with fire-retardant rock wool, taking special care to apply the minimum thickness of insulating material at all points of the roof so as not to reduce insulation.

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