Thermal insulation of sloping clay tile roofs can be performed by any of the following methods:

Roof insulated on horizontal slab

Insulation is placed in the upper part of the slab or floor, covering it completely, so as to minimise the risk of superficial interior condensation in winter.

This type of insulation avoids surface condensation on the ceiling it comes in contact with.

The following picture is a scheme of the application of this type of insulation:

lusa-ventilacao-desvao Legend:
1. Protection
2. Insulation
3. Steam barrier
4. Slab
5. Inferior coating (ceiling)

In the case of hollow roof tile roofs, ventilation is processed through the garret and the tiles. The use of hollow roof tile and insulation would make the use of the garret space impossible.

Inclined roof with insulation on the slope

In this case, thermal insulation is placed over the external side of the slab. Depending on whether insulation is continuous or discontinuous, several techniques may be used in the application of different types of insulation, as shown in the following pictures.

lusa-isolamento-en Legend:
1. Roof tile
2. Lath work
3. Rod
4. Insulation
5. Steam Barrier
6. Lining
7. Buffer

If using this type of insulation, roof tiles should not be directly laid on the insulation, nor should mortar or glue of any kind be used to fixate them to the insulating material.

Applying the lath work directly over the insulation should only be done under certain conditions, as mortar might not adhere to the insulating material. Lath work should still, however, be conducted as described in the previous section of this manual.