Features of the plaster
In radiant systems for wall and ceiling, The plaster is the seat of the heating circuits are therefore indispensable good conductivity characteristics of elasticity and at the same time.
Are shown plaster premixed lime / cement hydraulic lime.
With the type of plaster varies the average temperature limit that can be reached by the water, as you can see from the table that follows:
|Type of plaster||Temp.media max|
|Gypsum-based plaster||45 ° C|
|Plaster made of lime-cement||50 ° C|
|Plaster in hand||50 ° C|
Given the sensitivity of the phase of plastering, it is good to follow a set of guidelines:
before the preparation of the plaster sure 'suitability of the support: Surface regularity, absence of crevices and gaps, no dust and debris, to a pose in a workmanlike manner.
If the support layer is smooth, Little breathable or is an insulating layer, apply a mortar adhesion; for supporting layers in the stone mortar adhesion must be applied transversely using a notched trowel. This must be done before installing the radiant system.
If the size of the radiant wall exceed i 10 m in length, shall be provided at expansion joints to compensate for the thermal expansion arising from the operation of the system.
To prevent the formation of cracks and cracks in the layer of plaster, use of a network plaster. The dimensions of the meshes of the network depend on the position of the network in the layer of plaster: networks to lay in the intermediate layer may have a mesh from 7x7 mm up to 10x10 mm, while the networks to be grouted surface may have a mesh from 3x3 mm. For finishing layers in lime and lime-cement is recommended that a network has endeavored fiberglass sized about 3x3mm, the network must be then covered over with stucco much before it happens solidifying plaster.
Make sure that the plaster mesh meets the following requirements:
- Surface mass of about 145 g / m2;
- Resistance to alkalis.
La drawing up plaster can only happen if the air temperature is not less than 5 ° C, if the building envelope is not complete fixtures cover the openings with transparent plastic sheets so as to ensure adequate protection from the elements.
With finishes (eg paint) impermeable to water, make sure that the wall allows good breathability.
The application of the plaster
Checked for leaks before you can proceed to the application of the plaster on the supporting layer.
According to the recommendations of the manufacturer and as indicated above, apply a first layer of plaster of at least 15 mm thickness to obtain complete coverage of the modules.
Wait for the first coat of plaster is curdled: are sufficient 30 45-minutes, but the time can vary depending on the season and outdoor temperature.
Spread finally the second-hand of plaster, of a thickness of about 10 mm, for a total thickness of the plaster of about 23-25 mm, applying the finishing layer in a network with fiber glass mesh 3x3 mm.
La seasoning plaster requires a time-average 21 28 days, depending also on weather conditions: it should in any case follow the manufacturer's instructions.
If you want to do the insights on radiant heating systems, you can find valuable information at the following links: