6 best materials for ceiling insulation

Review of the best according to the editors. About the selection criteria. The the material is subjective, is not advertising and is not serves as a guide to the purchase. Before purchase is needed consultation with a specialist.

Ceiling between unheated attic and residential rooms need additional isolation. This process performed as above (the material is laid over the ceiling by lags), and from the bottom (insulation is fixed from the heated rooms and is sewn up with decorative panels). We prepared rating of the best materials for ceiling insulation that are suitable for different types of installation. Experts analyzed the characteristics insulation and reviews to them, which will help to choose the best material for the price, ease of installation and insulating properties.

Rating of the best materials for ceiling insulation

Nomination a place Name of product rating
Rating of the best materials for ceiling insulation 1 Mineral wool 4.9
2 Penofol 4.8
3 Expanded polystyrene 4.7
4 Penoizol 4.6
5 Foiled Polyethylene Foam 4.5
6 Styrofoam 4.4

Mineral wool

Rating: 4.9


The first place in the ranking is mineral wool. So called material obtained by melting basaltic rocks, therefore in sale of goods can be found under the designation “stone” or basalt cotton wool. Warming is achieved through education thin fibers tightly intertwined. At the same time the material is lightweight, flexible and with high insulation properties. Mineral wool is produced in rolls or square plates. It is convenient to choose for ceiling height insulation thermal insulation – there are options from 50 to 200 mm. Density insulation is from 11 to 200 kg / m³. The higher this indicator, the better material will keep the cold. Buyers in reviews share that cotton wool is easy to cut and it is not necessary to strictly observe the dimensions – extra the edges are simply compressed and inserted between the ceiling beams.

Our experts awarded the material first place in the ranking, because mineral wool has one of the lowest rates thermal conductivity. Depending on the density, it varies from 0.033 up to 0.040 W / mK. Also this option of ceiling insulation is maximally safe because cotton wool is environmentally friendly and does not burn.


  • absolutely not lit;
  • the insulation is not subject to decay;
  • rodents are indifferent to him;
  • light weight is optimal for ceiling construction.


  • hydrophobic insulation (absorbs water);
  • when mounting from the bottom to the ceiling, a sufficient amount is necessary supports, otherwise it will sag;
  • shrinks over time.


Rating: 4.8


Penofol – the material consisting of foamed polyethylene and screen. The reflective part is made from foil, 14 microns thick. Due to this design, insulation is easy bends and repeats the surface contour. She insulated the ceiling of the house as from the attic, and from the residential part. Goods are released in rolls and is in height from 10 to 20 mm. Index thermal conductivity is slightly inferior to the leader of the rating and amounts to 0.049 W / mK. Buyers in reviews like ease transportation of material, because in one roll 50 m. Penofol is attached to a special glue, which is not very pleasant smell, therefore, work on the insulation of the ceiling should conducted in a well-ventilated area.

Experts put insulation in second place in the rating for its reflectivity. Thanks to the foil layer, return of heat back to the room. In case of ceiling insulation penofol with two screens, a double effect occurs, contributing to the reflection of the increased temperature in the summer from the room, which keeps you cool.


  • a small height of 10-20 mm is practical for homes with low ceilings (does not take a lot of space);
  • easily bends and takes on any shape, which is convenient for warming relief ceilings (for example, where the beams go inside rooms);
  • low water absorption;
  • reflectivity.


  • the side with polyethylene burns and emits acrid smoke;
  • there are many low-quality fakes on sale;
  • high price;
  • cannot cope on its own in cold regions (required application paired with other insulation).

Expanded polystyrene

Rating: 4.7


Expanded polystyrene ranks third in the rating, which is a gas-filled material. Produce insulation made of polystyrene and copolymers. Unlike usual foam treated with steam, resulting in large cells, polystyrene foam extends the extrusion process, in which substance is passed through a hole with a small cross section. Thanks to this technology, a small-pore insulation is obtained and homogeneous structure. When insulating the ceiling, the plates are cut with a knife. By bending, they are 6 times stronger than polystyrene foam, but still break. But material ahead of competitors in density – minimum value starts from 27 kg / m³. Most often, goods with indicator of 35 kg / m³. It is possible to apply ceiling insulation in liquid view of the lags in the attic, but this requires specialized equipment.

According to our experts, the material has earned a place in the ranking for account of a large selection of plate heights. Available with 20, 30, 40, 50 mm in section. Thermal conductivity of expanded polystyrene ahead of mineral wool: the same effect will be them with a thickness of 30 and 57 mm, respectively. But in strength and ease of installation, he loses the rating leader. In reviews owners praise the ceiling insulation for grooves, allowing to mount a continuous surface.


  • not afraid of water and steam;
  • does not crumble when cutting;
  • homogeneous structure;
  • a large selection of options for the cross section;
  • density from 27 kg / m³.


  • takes up a lot of space during transportation;
  • when burning emits toxic smoke;
  • you need to more accurately adjust the dimensions on the ceiling;
  • low bending strength.


Rating: 4.6


The fourth place in the rating belongs to penoizol, which is one of the varieties of foam. The material is called carbamide-formaldehyde foam. It is formed from foam and resin enveloping each cell with air. Added to composition hardener (phosphoric acid), therefore the applied mass freezes. Most often, penoizol is applied in liquid form, for which hire masters with a special installation or purchase an apparatus and make all the manipulations on their own. Users in Reviews like the affordable cost of insulation and the fact that the material Does not create pressure on the walls of the structure. After polymerization lag and beam substances are not deformed.

We marked this material in the rating as the best for insulation ceilings of a large area and with complex relief. Penoizol is served from the installation in the form of a mass with a consistency resembling foam for shaving, so the substance fills the bottlenecks and crevices well. But they can only insulate the ceiling from the side of the roof.


  • material does not burn;
  • fine foam is not attractive for rodent housing;
  • thanks to the feed in liquid form, you can create any height insulation;
  • relatively cheap way to insulate the ceiling.


  • high water absorption (18-20% by weight);
  • additional finishing is required to protect ceiling from moisture;
  • at destruction emits formaldehydes and urea;
  • shrinkage and microcracks after solidification are possible.

Foiled Polyethylene Foam

Rating: 4.5


Fifth polyethylene foam. As the name implies, its composition includes foamed polyethylene duplicated by aluminum foil. But the screen here is located only on one side. Material for insulation the ceiling is produced in rolls and it happens: not crosslinked, chemically crosslinked and physically stitched. The most famous manufacturer of such a product is the Isolon brand whose name has become a household name and now refers to the material. Buyers in reviews like that foiled polyethylene foam can be fixed in various ways: stapler, screws, glue. The screen reflects from the ceiling up to 95% of the heat and returns back to the room. Good sound insulation with a small cross section of 5-8 mm. Density varies from 20 to 200 kg / m³.

We included insulation material in the rating, since it well suited for ceiling mounting in damp rooms (kitchen, bathhouse, bathroom). The foil not only reflects heat, but and resists water penetration. There are types of isolon with PET film, which increases the service life of the insulation and prevents screen corrosion.


  • environmentally friendly;
  • reflective effect;
  • good sound insulation;
  • Convenient transportation in rolls.


  • happens only in small sections of 5-8 mm;
  • in cold regions, application will be paired with another warming;
  • thermal conductivity 0.051 W / mK.


Rating: 4.4


In sixth place in the ranking, material known to everyone since childhood – Styrofoam. For the manufacture of used polymer, subject foaming. This forms large cells with thin walls. Most of the insulation is gas, so foam boards light – they can be mounted on the ceiling both inside the room and with side of the attic. Construction sealant is used for installation (foam in cans). Blocks are available in thicknesses from 10 to 100 mm, which is convenient for selecting the height of the insulation and the degree of insulation. But with by cutting with a knife, the plate crumbles, which delays the laying process. In addition, the joints need to be filled with foam, otherwise they will form “bridges of cold.”

Experts added material to the rating due to the most affordable prices in the category. With the help of polystyrene, the ceiling insulation is not will require a lot of funds from the family budget. Thanks to thin the walls between the cells the heat transfer process is significantly slows down. Masters in reviews like the lack of dust when laying, as is the case with mineral wool.


  • affordable price;
  • lets steam through;
  • no shrinkage;
  • Does not create a load on the ceiling structure;
  • various thicknesses (10-100 mm).


  • for fixing to the ceiling from the side of the room you need an installation foam;
  • when burning emits toxic smoke;
  • during installation, time is spent on closing up “cold bridges”;
  • exact cut to size is required;
  • corners crumble.

Attention! This rating is subjective, is not advertising and does not serve as a guide to the purchase. Before the purchase consultation with a specialist is necessary.

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