What is dry lining insulation?

Dry lining insulation, also known as internal wall insulation, is the process of attaching insulation boards directly to the inside of your external walls, which are then covered with plasterboard and skimmed. It is a highly effective way to prevent heat from escaping through solid walls.

How much space is lost when drylining walls?

When drylining walls, you typically lose about 100mm to 150mm of room depth. This thickness includes the insulation board (which ranges from 50mm to 100mm depending on target U-values), the fixing adhesive or timber battens, the plasterboard, and the final skim coat.

Is insulated drylining better than standard dry lining?

Yes. Insulated drylining panels combine high-performance insulation (like PIR or phenolic board) and plasterboard into a single composite sheet. This makes installation much faster and reduces thermal bridging compared to building the systems separately on timber studs.

Can I get a grant for dry line insulation in Ireland?

Yes, the SEAI offers substantial individual grants for dry line insulation. Homeowners can receive up to €1,500 for apartments, €2,000 for mid-terrace houses, €3,500 for semi-detached/end-terrace houses, and €4,500 for detached houses.

Does drylining prevent mould?

When installed correctly by professional drylining walls specialists, EWI and internal drylining eliminate the cold surfaces where moisture condenses, helping to prevent mould. However, it must be installed with a continuous vapour control layer to avoid trapping moisture inside the wall.

Drylining & Dry Line Insulation Guide

Learn how dry lining insulation transforms cold rooms, find out about SEAI grants, and connect with vetted local drylining contractors.

Drylining (often spelled dry lining insulation) is Ireland's most popular form of internal wall insulation. By adding high-performance insulated drylining boards to the inside of your external walls, you can prevent heat loss, eliminate drafts, and lower your energy bills.

The process of dry lining walls is especially useful for older houses built with solid stone or concrete blocks, which do not have a cavity that can be pumped. This dry line insulation acts as a thermal barrier, trapping heat inside and bringing your rooms up to modern comfort standards.

Freshly plastered drylining walls representing insulated drylining

How Drylining Walls Works

When undertaking a drylining project, installers typically use one of two main methods to secure the system:

Dot and Dab (Direct Bonding): High-performance composite insulation boards (insulated plasterboard) are glued directly to flat brick or block walls using specialist adhesive dabs. This is the fastest and most space-efficient method.
Timber or Metal Stud Battens: If the existing walls are damp or uneven, installers build a secondary stud framework. The insulation is placed between and over the studs before fixing plasterboard on top.

Whichever method is selected, ensuring a perfectly sealed vapour control layer is critical. This prevents warm, moist indoor air from penetrating behind the boards and condensing against the cold outer wall.

Benefits of Insulated Drylining

Warmer Rooms

Eliminates cold wall surfaces for immediate thermal comfort.

Reduced Heating Bills

Reduces heat loss by up to 35%, lowering energy costs.

Better BER Rating

Improves your Building Energy Rating, boosting property value.

SEAI Grant Approved

Access up to €4,500 in government grants to offset installation costs.

Drylining vs External Insulation

Advantages of Drylining

Cost-Effective: Significantly cheaper upfront than external wall insulation (EWI).

Aesthetic Preservation: Perfect for brick or stone-faced buildings where you cannot change the exterior look.

Weather Independent: Works are completed entirely indoors, so installation can happen year-round.

Disadvantages of Drylining

Space Loss: Reduces internal room dimensions by approximately 100mm per external wall.

Internal Disruption: Rooms must be completely cleared, and fixtures (sockets, radiators) moved.

Thermal Bridging: More challenging to insulate junctions where internal walls and floors meet the external structure.

Verified Drylining & Internal Insulation Installers

Because proper installation is critical to prevent condensation, you should always choose a fully registered, vetted professional. Below are certified contractors available for your project:

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Frequently Asked Questions

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