Summer house water penetration (through loose knots) (Ed.)

[PortlandBill1]

My Summerhouse has many many knots.
I have painted the outside over the past 4 years about 12 times with RONSEAL FECELIFEPLUS
The inside the knots are bad and I have treated each with Knotting liquid
I have emulsioned the inside with 5 coats paint
When it rains dampness still comes through the knots

Can I put a sealing coat on the outside over the many coats of Ronseal plus
Can I put a different coat on the inside ?

Thanks

 

[Deleted member 323070]

A picture of the outside would help.
Perhaps one of the overall structure, and one close up showing a typical surface.

 

[PortlandBill1]

The knots were treated before painting with knotting liquid
Inside many coats
Lots coats on outside
Water stains on inside on rainy days drys out in good weather

 

[scbk]

Tbh it probably wouldn't be a problem if you hadn't painted the inside.

For a start you could paint the outside with something more water repellent like Sadolin or Bedec Barn Paint

 

[PortlandBill1]

Thanks I have spoken to Bedec and will get 5 litres Barn paint in Eucalyptus

 

[freddiemercurystwin]

People have posted this many times and tried various sealants, silicone etc often with little success, timber cladding is not waterproof and should never be considered as such. Timber cladding should be considered as a rain-screen not rainproof, if you want a timber clad building to remain dry inside you should always fit breathable membrane on the outside of the studs, then vertical battens to create a ventilated cavity and then your cladding, any rain that penetrates the cladding can then drain out of the bottom of the cavity, it's a fundamental construction detail the shed suppliers always conveniently fail to tell their customers, their small print or a discussion with someone in the know (and honest) from the supplier will tell you the cladding is not rainproof. Too late now though.