Moisture Detection in Alfama
Arranja Já covers moisture detection in Alfama, and our team travels out to the Castelo, the Sé, Mouraria, Santa Apolónia and the escadinhas around São Miguel. This is the hardest part of Lisboa to diagnose and the most rewarding to get right. The buildings are old, built of stone with tabique partitions above, packed tightly together on a slope, and many of the ground floors sit against earth or rock. Sunlight barely reaches some façades. Almost none of these walls has a damp-proof course, because none was ever built with one. If you have flaking plaster, a white bloom on the wall or mould that returns every winter, the only way forward is to measure before anyone decides what to do.
25K+
Interventions
4.8
Average rating
98%
Satisfaction
10+
Years experience
About our service in Alfama
Three mechanisms are at work in a neighbourhood like this, often together. Ground water rises through the base of the masonry and brings dissolved salts with it, which is why the plaster crumbles and a powdery crust forms rather than a simple stain. Rain and run-off from the street or from a neighbouring roof soak into walls that face away from the sun and never dry properly. And inside, humid air from a small kitchen or a shower condenses on cold stone in a flat with one window and no through draught. A wall can be wet from below and damp at the surface for entirely separate reasons, which is why a single explanation offered on the doorstep is rarely worth much. Our method is comparative. We take readings at intervals up and along the wall, look at the same wall in a dry room, and see how the values fall away with height or distance. We check the coldest surfaces, look at where the water goes when it rains, and note anything altered by earlier work: a cement render over old lime plaster is a very common find here, and it holds moisture in a wall that was designed to release it. Access shapes the visit too, so tell us in advance about stairs and narrow entrances. On a building this old we may be able to say confidently that moisture is arriving from the ground, without pinpointing one entry point at a first pass, and we will tell you when that is the case. You get a written report with the values, photographs and a plan in sequence: find the cause, deal with it, let the wall dry, then close up and paint. Lime-based render, waterproofing and drainage work belong to our bricklaying service, an escaping pipe to our water leak repair service, and decoration to our painters at the very end.
Our moisture surveys in Alfama include:
Services Included
- Comparative readings up and along old stone and tabique walls
- Salt-affected plaster assessment in ground-floor rooms
- Diagnosis of cement renders trapping moisture in breathable walls
- Run-off and rain exposure checks on shaded façades and alleys
- Report with readings, photographs and the order of works
Areas We Serve
We cover the Castelo, Sé, Mouraria, Santa Apolónia and the streets and escadinhas around São Miguel, including hard-to-reach upper flats.
Work Gallery
Rating
(4+ reviews)
- Response within 2h
- Verified professionals
- Satisfaction guaranteed
Guarantee
You keep the written report and the readings behind it. On buildings of this age we say honestly when several causes overlap, or when a single visit narrows the answer without settling it, and we explain what a further reading would add.
Hours
Mon-Sat: 9am-8pm
Sunday: Closed
You keep the written report and the readings behind it. On buildings of this age we say honestly when several causes overlap, or when a single visit narrows the answer without settling it, and we explain what a further reading would add.
Frequently Asked Questions
What people in Alfama usually want to know:
My plaster is crumbling and there is a white powder on the wall. Is that mould?
No, that is a salt deposit, and it tells us something useful. Salts arrive dissolved in water that has come up through the masonry from the ground, then crystallise as the wall surface dries, pushing the plaster off from behind. Scraping and repainting will not hold. The readings show us how far up the wall the moisture reaches, and the plan usually involves a breathable, lime-based repair rather than another coat of cement.
A neighbour's builder said my wall needs injecting. Should I agree?
Not until someone has measured it. Injection is aimed at one mechanism, moisture rising from the ground, and on these walls it is often the wrong target, or only part of the story. We have no treatment to sell, so the report simply says what the values show. If they do point to ground moisture, you can commission that work knowing why; if the real driver is condensation or run-off from outside, you have avoided paying for something that would not have helped.
Winter mould in my flat clears in summer. Does that mean the building is fine?
It means the mechanism is seasonal, which points strongly at condensation rather than water entering the structure. Cold stone, humid indoor air and very little ventilation are all it takes. That is good news, because the remedy is about air movement and dealing with cold surfaces rather than opening up walls. We do check for infiltration as well, since a shaded façade in Alfama can also be slowly taking in rain.
Other services in Alfama
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What Our Clients Say
Reviews from satisfied customers in Alfama and surroundings
"Trabalho muito bem feito. Profissionais dedicados e simpáticos."
Paulo T.
Alfama
"Profissionais competentes e pontuais. Voltarei a contratar."
João F.
Alfama
"Excelente atendimento e resultado impecável. 5 estrelas!"
António M.
Alfama
"Muito satisfeito com o trabalho realizado. Equipa de confiança."
Marta V.
Alfama