How to Repair Small Areas of Plaster

How to Repair Small Areas of Plaster | Drywall Patching

Рет қаралды 62,628

3 ай бұрын

Sam Ward demonstrates how to repair low-level plaster.
MORTAR MIX
• 4 x Sharp Sand
• 1 x Castle Cement
• Sika 1 Waterproofer
www.builderdepot.co.uk/sika-1...
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For patching a plaster repair, a suitable mortar mix should ideally be compatible with the existing plaster in strength, porosity, and thermal expansion to avoid cracking or detachment.
A traditional mix often recommended for such repairs is a lime-based mortar due to its flexibility, breathability, and ability to accommodate minor movements within the building structure without cracking.
Lime-Based Mortar Mix
• Lime Putty: Pure, non-hydraulic lime putty is preferred for its flexibility and permeability.
It allows the repair to breathe, reducing the risk of trapped moisture, which can lead to damage.
• Aggregate: Fine sand is typically used as the aggregate in plaster repair mixes.
The sand should be clean, well-graded, and free from impurities.
The colour of the sand can be chosen to match the existing plaster colour.
• Mix Ratio: A standard mix ratio for lime mortar for plaster repairs is 1 part lime putty to 3 parts sand by volume.
However, this can be adjusted based on the specific requirements of the repair, such as the desired strength or finish.
Considerations
• Compatibility: Ensure the mortar mix is compatible with the existing plaster, especially if the building is historic.
In such cases, matching the original materials as closely as possible is essential.
• Application: Apply the mortar in thin layers, allowing sufficient drying time between layers.
This approach helps to prevent cracking and ensures a strong bond to the existing plaster.
• Curing: Lime mortar cures slowly and needs to be kept moist for several days after application to ensure proper carbonation and hardening.
Protect the repaired area from direct sunlight, wind, and rain during this period.
Alternative: Gypsum-Based Plaster
A gypsum-based plaster might be used for interior repairs, especially in modern constructions. It sets faster than lime mortar and can be easier to work with for minor patch repairs.
• Mix Ratio: Follow the manufacturer’s instructions for mixing, as ratios can vary.
• Application: This can be applied similarly to lime-based mortars but usually dries and sets much faster.
Final Note
For best results, especially on historic buildings or where the plaster plays a structural role, consulting with a professional conservator or a tradesperson experienced in traditional building techniques is advisable. They can offer guidance tailored to the specific type of plaster and conditions of your building.
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#plastering #diy #patching
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Пікірлер: 52

@vincentwilkes9611 3 ай бұрын

I always enjoy seeing someone who knows what they are doing.

@woodyscst 3 ай бұрын

Give that man a KZfaq channel! Loads of top tips. A few days too late for me and my project but definitely one for next time, cheers!

@SebSmythe 3 ай бұрын

Always like watching Sam, a safe pair of hands and hard to find a dynamic guy like this. 👏👏👏

@SteveHit1 3 ай бұрын

An excellent video - not only is Sam highly skilled but also an excellent teacher.

@Mee33342 3 ай бұрын

Man who takes, pride in his job.

@SteveAndAlexBuild 3 ай бұрын

Nice job Sam 🙌🏽🧱👍🏽

@lesliedickinson198 3 ай бұрын

Great information on how to use equipment for plastering,,,,,i never cease learning,,,,,,,also wonderful tips ty so much

@gilly2guitars 3 ай бұрын

Lovely job!

@JohnnyMotel99 3 ай бұрын

Can you do a video on the best way to fill small movement cracks so they never reappear.

@gdfggggg 3 ай бұрын

Remove the surface, back to the substrate, 100mm either side of the crack. Use a metallic mesh fixed to the substrate; you can do this by drilling a 6mm hole, then use 2-3 40mm galvanised nails into the hole. Soak the substrate in SBR then while wet use a 5to1 cement render, and leave a couple millimetres to the surface; scratch the render with lines. When dry, coat in SBR, let dry then plaster over, leaving slightly proud. When the plaster is dry use a random orbital sander to smooth back with about 80 grit paper. You’ll never know it was there.

@ThriveTalesTV 3 ай бұрын

@@gdfggggg he said VIDEO . its better to see something once then hear about it 100 times

@GarrisonFall 3 ай бұрын

@@gdfggggg Thanks for your explanation. Very clear instructions.

@hajirpirouzfar9481 3 ай бұрын

The issue is finding tradesman who are willing to go to that level of perfection

@dave1secondago 3 ай бұрын

cracking job

@gdfggggg 3 ай бұрын

I see what you did there.

@netwarecracks7780 3 ай бұрын

great stuff

@bobbydazzling 3 ай бұрын

Time will tell. Bring back James

@peepiepo 3 ай бұрын

Is this a re-upload or deja-vu?

@BitsnBobs-hk5iy 3 ай бұрын

Definitely seen it before

@jonp6798 3 ай бұрын

He’s just confident for a second time that he’s cured the problem

@triedzidono 3 ай бұрын

we saw this place before when it had mystery damp in the wall. Or you saw it in a dreamy premonition. Plastering is fun, if you do multiple small mixes & layer it up. Or do one and use some skill like this bloke just did. way too big of a mix but waste is part of getting home by 5pm. Would have just done a few small pot mixes to fill that myself, but would have spent all day on it alike. Each to their own.

@patbird9694 3 ай бұрын

Its new to me. I couldn’t stand Roger so I stopped watching

@fireblaster9961 3 ай бұрын

Why would you use a small trowel

@noelter 3 ай бұрын

He's a 100%✓ for what he is doing.

@tommotube 3 ай бұрын

Why use mortar rather than a gypsum based bonding coat? Heard it mention in the vid but no explanation. Cheers

@tomalex4806 3 ай бұрын

I thought that. I'd of used bonding

@gdfggggg 3 ай бұрын

A bonding coat won’t be waterproof. A sand/cement coat with a waterproofing additive will be.

@tomalex4806 3 ай бұрын

@@gdfgggggi thought you'd use bonding for jobs like this?

@gdfggggg 3 ай бұрын

@@tomalex4806 not on waterproofing jobs.

@TooMuchInfoSir 3 ай бұрын

In a previous video they talked about this house suffering from damp. So this was above and beyond. My builder mate said to me (as im reno’ing atm) to S&C external walls, thistle internal. Gypsum doesn’t handle moisture well 👍

@smietniknautube 3 ай бұрын

Why don't you use gypsum?

@tiagdvideo 3 ай бұрын

best I've seen

@rm9719 3 ай бұрын

I thought Sam was going to scrim the top area before adding the plaster?

@Cagstok 3 ай бұрын

Bit of context on the use of the additive would be welcome

@patbird9694 3 ай бұрын

Welcome new guy. I was getting tired of Roger whinging about pipes

@magicsilence 3 ай бұрын

PVA might not be *technically* necessary, but can't see the harm in it, and no scrim tape on the angle beads, again, why not, takes literally 10 seconds, and massively reduces risk of cracking

@gdfggggg 3 ай бұрын

Don’t use PVA on any damp issues as it re-emulsifies. SBR is the stuff. A quick SBR and cement 50/50 x2 coats on the wall, then a waterproofing additive (SBR or waterproofer) in the cement render is what I’d do. I’d probably add a render mesh as it’s so easy (if it’s on the van). SBR is a gift from the render gods.

@SkillBuilder 3 ай бұрын

you are so right. Why don't we have a National SBR day to celebrate this wonder product? I meet plasterers who have never used it. I also saw that B&Q were selling it for £45.00 for 5 ltrs

@gdfggggg 3 ай бұрын

@@SkillBuilderI sleep with SBR under my pillow 😂

@gdfggggg 3 ай бұрын

@@SkillBuildertoolstation 27.99

@bluevanmani 3 ай бұрын

£18 in my local hardware store