Flat Roof Covering in Kaunas: Services, Areas and 2026 Prices

Kaunas has one distinctive feature that other Lithuanian cities largely lack — it holds the oldest flat roof stock in the country. Interwar modernist architecture used the flat roof not as a technical expedient but as a stylistic element. Those roofs are now around a century old, and they raise questions nothing else does. This article covers modernist buildings, industrial premises and what gets handled differently here.

Interwar modernist roofs

In interwar architecture the flat roof was a deliberate choice — part of the style rather than simply the cheaper option. There are many such buildings in the city, and they form a category of their own.

What makes them distinctive:

• The age of the construction. This may be the oldest flat roof you will ever see — with everything that follows from it.
• Nothing original remains. Over a century the covering has been replaced several times, and every repair left its own layer.
• Mixed construction. Monolithic concrete, timber, steel beams or a combination — depending on the building and the period.
• There was no insulation originally. It was added later, sometimes in several stages.
• There was no vapour barrier. Nobody thought about it when it was built.
• Heritage constraints. What is visible — parapet profiles, trims, proportions — often cannot change.

The last point is the key difference from ordinary refurbishment. The solution has to fit within the existing form: raising the parapet to accommodate thicker insulation is frequently simply not permitted.

What that means in practice

When height cannot be added but insulation is needed, a limited set of options remains:

• Strip all the old layers. That often frees up exactly what is missing — and reveals the structure at the same time.
• Choose thinner insulation with better conductivity. Dearer per square metre, but the only way to fit.
• Replan the fall so the tapered layer adds as little height as possible.
• Consider internal insulation where external work is impossible — but only with calculation.

That last option is worth reading about separately, because it carries risk: insulating from inside.

And a practical note: in such buildings levels are checked first, before materials are even discussed. It is the commonest reason a design changes mid-works.

How to survey such a roof

A hundred-year-old roof almost never comes with documentation. So the sequence is the same as for any old building, only more core samples are needed.

1. Inspection from below. In the loft or top floor the construction type and traces of damp are visible.
2. Layer count at the edges. At the parapets it is usually possible to see how many times it has been covered.
3. Several core samples in different places. Condition on a century-old roof is almost never uniform.
4. Measuring levels. From the deck to the top of the parapet and to the door thresholds.
5. Structural assessment, if weight is to be added.

More on this in our old building refurbishment article.

Details on modernist roofs

Interwar architecture has solutions of its own that later buildings no longer carry. They look good and are technically demanding.

• Rounded parapets and corners. The covering has to wrap a curved form — bituminous membrane has an advantage here, because it is formed on site.
• Projections and cornices. Often concrete, degraded over decades, and the covering terminates exactly at them.
• Terraces and balconies built into the form. These are usable areas whose build-up differs from the surrounding roof.
• Internal drainage cast into the structure. Pipes may run inside the wall, and their condition is unknown.
• Differing levels. Steps and setbacks are characteristic of the style — every boundary is a detail.

The practical conclusion: on such a roof the number of details is out of proportion to the area. A thirty square metre terrace can carry more of them than a hundred square metres of plain roof, and that drives cost more than the material does.

Where the roof includes a terrace

In modernist buildings a roof terrace is often part of the original design rather than a later addition. That changes the solution.

The key point is that on a terrace the waterproofing stops being the top layer, and water runs on two levels — across the surface and beneath it. The outlet has to accept both.

In older buildings what is typically found:

• Covering directly beneath the paving, with no drainage layer.
• Single-level drainage — the lower level has no outlet at all.
• A threshold with no channel, so water enters the room in heavy rain.
• Paving bedded in mortar, the removal of which destroys the covering with it.

The solutions are set out in our usable roofs article. In an old building one constraint is added: height usually cannot be gained, so the pedestal system is chosen by what room exists rather than what would be ideal.

Industrial and logistics buildings

The second large category — warehouses, production space and logistics centres, of which there are many around the city and along the main routes.

Everything here differs from a modernist building:

• The construction is profiled steel on steel trusses. Light, flexible, with no reserve.
• Wind is the governing load. Fixing density is calculated by zone rather than uniformly.
• Areas are large — and so are the water volumes in a downpour.
• The building operates. Loading, production or trading does not stop for a roof.
• Much plant and many rooflights. Each is a detail, and rooflights are also a safety question.

We cover this group in detail in our commercial buildings article — including why rooflights do not carry a person’s weight.

Soviet-era and later stock

This part is essentially the same here as in other cities, so briefly.

• Apartment blocks — many vent shafts, internal drainage, several layers, often no overflow.
• 2000s construction — insulation present but thin; fall designed to the minimum.
• New build — good designs, but a lot of plant and later penetrations.

How decisions get made in an apartment block is covered separately.

What is handled differently here

In summary — three things worth keeping in mind.

First: age. In a modernist building you will most likely find more layers and fewer documents than anywhere else. So the investigation element is larger, and the contract should set out scenarios.

Second: form. Where heritage constraints apply, the solution has to fit the existing height and leave the visible elements unchanged. That limits material choice more than the budget does.

Third: scale. On industrial buildings what matters most is not the material but the fixing calculation and organising the works without stopping operations.

Everything else — fall, details, vapour barrier, maintenance — applies equally everywhere. That is set out in the complete guide.

Working on a heritage building: what to expect

Where constraints apply, one stage is added that an ordinary building does not have — approval. It is not complicated, but it takes time, and that belongs in the programme.

The practical sequence:

1. Establish which constraints apply and to what exactly — the whole building or only the visible elements.
2. Survey and measure levels, because the solution will have to fit the existing form.
3. Develop a solution that leaves the protected elements unchanged: parapet profile, trims, proportions.
4. Obtain approval, where the nature of the constraints requires it.
5. Only then order materials.

The last point matters. Ordering materials before approval is the commonest reason works stall — because it may emerge that thinner insulation or a different trim is required.

The good news is that constraints rarely prevent putting a roof right. They limit what is visible, not what sits under the covering. Fall, vapour barrier, insulation and details can all be done properly — as long as the existing height is respected and the external line stays unchanged.

Season and planning

The climate is similar across the country, so the same logic applies.

• The working season runs from late spring to autumn.
• Summer is the most convenient and the busiest. Worth booking ahead.
• Winter is for urgent work only.
• A survey is possible any time, and winter is arguably more informative — you can see how the snow melts and where ice forms.

And the key climatic detail: the worst thing for a roof is not cold but frequent transitions through zero. Water in the details freezes and thaws, and each cycle widens the existing gap. So details age faster than the field, and the spring survey is the most informative.

What to have ready

1. The construction period and, if known, when the roof was last covered.
2. Whether the building has heritage status or external constraints.
3. Where and when it leaked, with photographs if you have them.
4. Whether any documents exist — drawings, warranty certificates, old invoices.
5. How the roof is accessed.
6. Whether the building will be in use during the works.

The second point matters more here than elsewhere. If constraints apply, they have to be known before a solution is chosen, not discovered during approval.

How to assess quotations

• Whether the scope matches. Stripping old layers or covering over them is not the same job.
• Whether the number of details is stated. In older or apartment buildings they drive cost more than area.
• Whether the height question is addressed. In a modernist building that is the governing constraint.
• Whether the work is done in-house or subcontracted.
• Whether a written finding follows the survey, or only a figure.

A figure without a scope says nothing. It only becomes comparable once it states how many layers are stripped and how many details are solved.

The most common mistakes

1. Levels checked after materials are ordered. In an old building that is the commonest reason a design changes.
2. Quotations collected without a survey. Different jobs get compared.
3. Not asking how many layers there are. On a century-old roof that decides half the price.
4. Heritage constraints not established. They surface too late.
5. Uniform fixing density on an industrial roof. Wind load at the corners is several times higher.
6. Recovering without correcting the fall. The ponds remain.
7. No documentation handed over. The next person starts from zero again.

What drives the cost

• The age of the building — it determines the layer count and the scale of investigation.
• Whether constraints apply to form and height.
• Number of details — old stock carries many even on a small area.
• Whether old layers are stripped and where they go.
• Whether the building stays in use and what phasing that needs.
• Access — height, courtyard, lifting arrangements.

General pricing is set out in our cost article.

How the work proceeds

Related reading

• The complete flat roof guide
• Old building refurbishment
• Commercial flat roofs
• Flat roofing in Vilnius