ᐅ Interior plaster and exterior render at the same time?

I am currently building with Poroton and had a plasterer on site the day before yesterday. He recommended applying both the interior and exterior plaster very soon after each other because if the house is only plastered on the inside and left to overwinter like that, it can negatively affect the plaster. This is due to moisture being drawn in from the outside.

Originally, I planned to do the interior plaster this year and the exterior plaster next year, with the idea that this would allow everything to dry more thoroughly. On the other hand, his advice makes sense since the bricks already absorb water when it rains on the facade.

What are your experiences with this? The plasterer would apply the exterior plaster directly after the interior, with a maximum gap of about 7 days. Since the plastering needs to be done anyway, is it better to do it all at once or wait some time to let everything dry out a bit?

By the way, the screed will probably be installed shortly after the interior plaster is done, so the house will then be subjected to a large amount of moisture all at once.

Best regards!

Complete nonsense what he is saying. You can also apply the exterior plaster later. However, there is no reason not to do it at the same time, but keep in mind you need to be able to open windows for ventilation or set up many dehumidifiers.

Regarding the screed, definitely wait at least 4 weeks in between. Otherwise, it will be way too damp inside the house!

Bookstar schrieb:

Complete nonsense, what he is saying there

On the weather-exposed side, I have often seen houses with dampness inside. I wouldn’t take the risk.

Ok, so with plastering, I can make fewer mistakes than without plastering, provided, of course, that I ensure very good ventilation and try to delay the screed drying a bit.

A house without exterior plaster is difficult to properly dry out and season. In this case, you should use construction dehumidifiers. Ventilation alone will not be sufficient. It makes sense anyway, as otherwise you will have increased heating demands for many years until the house is fully dried.

tomtom79 schrieb:

I have often seen houses on the windward side getting damp inside. I wouldn’t take that risk.

That can’t be true. There are houses that stand for several years without exterior plaster/render, and they have no problems—only slightly higher heating costs.