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Concrete Roof Insulation

Fri Jun 24, 2016Total posts : 1
Omar Chaudhry
Omar Chaudhry
Join date: Jun 2016
Topic: Concrete Roof Insulation

Hello all.
I am looking at different options for concrete roof insulation.
My house is under construction, so any change / amendment can easily be made at this stage.
There are 2 open to sky terraces on first floor ( 300 sq feet each ) , with rooms below them on Ground Floor. So I need to insulate the floors of these terraces to stop summers heat from entering the rooms below. Please note that at finishing stage I would be installing marble or porcelain tiles in these terraces.
Further, the top most roof of first floor is about 4,000 sq feet. I would like to insulate this as well, to save the rooms on first floor from direct heat of summers. Upon finishing here I would lay 4" to 5" compacted mud, and then brick-tiles over this.

My query is for both of the above said insulations, should I be using XPS ( Extruded Polystrene sheet ) or  EPS ( Expanded Polystrene sheet ).  For 2" thickness, my understanding is that both give same level of heat insulation.  For water proofing I would be using bitumen + Polythene.  So for heat insulation which product is better , less costly, with longer life ?   Generally the EPS is cheaper than XPS, so is it worth to spend more for XPS ?
Please advise. 
Thanks in advance


Sat Jun 25, 2016Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Omar
   

Thermal insulation is a method to reduce the transfer of heat from outside to inside. To make house heat proof, thermal insulation is a good choice. An insulated home is more comfortable as the temperature remains consistent over weather changes. It makes the house comfortable and keeps the temperature of   house cool in summers and warm in winters. It is very useful to keep the temperature of the house independent from outside temperature.

 

General Principles of Thermal Insulation

• Thermal resistance of an insulating material depends on the type of material and the thickness.
• Provision of an air gap is very important and useful insulating agent.
• Orientation of the building has important role in thermal resistance.
• The building/house design is done in such a way so that entry of solar energy in summer should be minimum and in winter it should be maximum.
 


Choice of Insulating Materials

Choice of insulating material depends on following considerations.
• Cost of insulating material.
• Area to be covered for insulation.
• Standard of insulation to be required.
• Cost of energy consumed for heating and cooling.
• Reasonable fire proof
• Non absorbent of moisture
• Not liable to undergo deformation
• Resistant to attack of small insects

Insulating Material

1. Rock wool.
2. Slag slabs
3. Mineral wool slabs
4. Aluminum foils
5. Cement concrete block with lightweight aggregate.
6. Gypsum board
7. Asbestos cement board
8. Clip board
9. ACC cement board
10. Chip board
11. Foam glass
12. Gasket cork sheet, foam plastic etc.  

How to apply insulating material

Apply CPRX compound of Shalimar Tar Products (STP) on ceiling of roof.  For fiberglass or glass wool insulation, you can fix 2" thick pieces. For Thermocol or rubber foam, you can fix 2'X2' pieces. These can also be fixed into wooden frames 2' X2' size. Finally, cover the treatment with 24 gauze perforated aluminum panel.  

How Thermal Insulation is Beneficial

 Comfort: The temperature of the room remains cool in summer and warm in winter than that of outside atmosphere. Therefore, by providing thermal insulation one feels comfort both in summer and winter season.
 Fuel saving: Fuel is required to maintain desired temperature of the room. By providing thermal insulation, the transfer of heat/cold reduces between inside and outside of the room.. Hence, it saves fuel.
Condensation Resistant: Thermal insulation materials fixed on inside surface of the room walls prevent condensation on interior walls and ceiling. Condensation is deposition of moisture and takes place when warm air comes in contact of surface having temperature below dew point.

Thermal Insulation of Exposed Walls

The heat and cold radiate through exposed walls of the house. There are following methods of thermal insulation of exposed walls.
1. You may provide suitable thickness of wall.
2. You may provide Hallow wall or cavity wall.
3. You may fix Hardboards or ply board on wooden batten over the wall for creating air space.
4. You may fix Thermal insulating material sheet inside and outside exposed wall to reduce heat/cold transmission.
5. You may construct outer wall with thermal insulating material if you have frame structural building or non-load bearing walls.

 

Thermal Insulation of Exposed Doors and Windows

Outside doors and windows transmit heat/cold through the room from atmosphere. The methods providing thermal insulation are following.
1. The frames of doors and windows are of wood.
2. You should not use Iron or pressed steel frames as they transmit more heat and cold than that of wood.
3. You may fix Insulated glass in glazed doors and windows.
4. Double glass with air space provided on glazed door will reduce transmission of heat/cold from outside to inside.
5. You may provide sunshade projection on doors and windows to protect them from heat and rain.
6. You may use Curtains, ventilation blends etc. on exposed doors and windows.

Thermal Insulation of Exposed Roof

The roof of the one storey building or top roof of multi storey building is an exposed roof. Heat/cold transmits through exposed roof in the building. There are two types of treatment for thermal insulation of exposed roof by providing treatment at the bottom or top of roof slab.

a) Internal Treatment:

1. You can treat both types of slabs both types of slabs either flat roof or pitched roof.
2. You should provide Air gap for under exposed surface of roof by fixing false ceiling under the roof.
3. Ventilation abutting the roof also helps for passing the heat out of the room.
4. You should install false ceiling with thermal insulating materials.
5. You may paste suitable adhesive and sealers at inside surface of the exposed roof for fixing Light insulating materials. Some insulating materials are glass wool, fiber glass wool, mineral wool, thermocol, rubber foam etc.


b) External Treatment:

 Suitable shade may be provided on exposed top surface of the roof for reducing solar radiation.
2. Shining and heat reflecting coating may be applied on the top of exposed roof like paint.


3. These coatings can serve dual purpose of water proofing and heat reflection.
4. In case of flat roof you can create air space on top of roof by placing asbestos sheet on brick pillars.
5. The surface temperature of flat roof may be reduced by sprinkling water on roof at regular intervals during hot hours.
6. The surface of flat roof may be kept cool by storing water on roof.
7. ‘Mud Phuska’, which is a mixture of clay soil, wood shaving, and water, should be laid on exposed roof acts as thermal insulation.
8. The earth laid under tile terracing on top roof also serves the purpose of thermal insulation and helps in giving proper shape for drainage of rain water.   

1.

 

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