Isolating Sulphate Salts

You know them damp patches that keep coming back and spoiling decoration after you paint? Well with the Dryflex system you can use this method to isolate the salts without hacking the plaster off. Watch how we do it.

[@johnginnelly1664]

Great video as always damp Sam is your man who can FIX IT

[@dampsam]

Thank you 🙏

[@2001pioneer]

Damp Sam, thank you for your informative videos! I'm trying to help my parents get damp spots on the chimney wall fixed. They had a leak from the chimney , which has been fixed, but that took time to get done. So I think the chimney got wet inside. So after a drying out period the builder came and re plasterboarded and plastered.... and low and behold the damp spots appeared. I got a damp surveyor out and he diagnosed the salt dampness. I resisted saying Damp Sam told me this! He has proposed removal of recently installed plasterboard, install Delta PT System and re-plastering at a cost of £1,200. I don't think it involves any drainage system so I'm concerned any moisture from the chimney ( Residual wetness from the leak; any penetrating damp from old chimney bricks) might condense behind this and cause dampness down the bottom. I clearly think I'm an expert after watching your videos! Far from. I wonder if the treatment above would work instead of the more extensive treatment. I would be *very* grateful for your advice! Jen

[@dampsam]

Hi jan, there are different methods of isolating the salts and a large proportion of damp contractors do use the cavity drainage membrane, it is designed so air will flow across the surface of the masonry evaporating any ingress.. not many know how to use the dry flex system but it is an option if the plaster is sound.

[@2001pioneer]

@@dampsam Thanks so much Sam for taking the time to reply! Can you please come to Glasgow for a job and I'll feed you haggis and whisky?

[@oliveranthony8379]

For weeks I've been searching for something like this video and knowledge of products. Thanks for sharing, we've been trying to use damp stop or zinsser paint but the staining is still coming through on the top of the chimney breast and top of the ceiling with the heavy heavy rain we've seen recently! (Chimney has a cowl fitted, house built in 1880 so definetly would have had heavy fossil fuel use pre being blocked up)

[@dampsam]

Great stuff thanks for watching

[@willm437]

Cool. Great tips mate 👍

[@dampsam]

Thanks for watching 👌

[@adriancarey7848]

Great idea.

[@dampsam]

Thank you 🙏

[@videoraver]

Will the new plastering on top be level, if you don't hack off the old plaster?

[@dampsam]

Yes a good plasterer can blend in anything

[@MaintenanceENG]

If you wss to patch up plaster knocked off bottom of an internal wall that had salts ( no leak) what would you use for a house in 1930s? Ta.

[@dampsam]

Without seeing at least some pictures I can’t really comment, you need to make sure the right system is used for the right type of damp problem. At this time of year it could be a number of types of dampness affecting the wall.

[@waynebungay6496]

I thought bonding agents were chemical and not mechanical

[@dampsam]

Yes your right they are a chemical based fluid but in plastering terms they are referred to as a mechanical key as opposed to a physical key when you scratch render or use a comb scratch.