How to repair cracked concrete driveway?

[davedave]

Hi, I have some long cracks in my driveway - are these suitable to fix myself and if so what products? Or would I be better paying someone to do the job?

[approachmhn]

Thanks @EricL. will do the sealing as suggested.

Good evening @Dave-1,

I did check around before confirming that the leak is from sealant.

i observed leak last august, and then sealed it. There was no leak after that till this November beginning. 

It was hot from last 2 weeks with no rain. Might be the sealant is cracking and giving up space for water to seep in. 

[Dave-1]

Morning @approachmhn 

I know that frustration feeling when something that has been fixed appears again. I had that with my patio and underneath I could see water on the walls after it poured. Turned out it was my steps that were allowing most water under. 

Then The option that @EricL has suggested is the one id be doing as well. 😕 Pain in the neck but hhopefully it will be able to handle the heat and rain.

Dave

[approachmhn]

@EricL can I paint after sealing on the area where concremate is applied?

so that the surface looks sae all along.

thanks

[MitchellMc]

Hi @approachmhn,

Yes, you can paint over the Concremate. Just ensure that you sand it smooth; otherwise, you'll be able to see the repaired area through the paint. Remember to wear PPE, including a face mask.

Mitchell

[approachmhn]

Thanks @MitchellMc .

this is what I need to do. Correct me if I am wrong 

1) remove the existing sealant and clean the surface

2) put on concremate and allow it to dry for couple of days.

3) sand on concremate to smoother the area.

4)  Apply  CPC 1L Shower Plug Sealant on top of smoothened concremate area.

5) after couple of days, paint it.

[MitchellMc]

Hi @approachmhn,

Sorry. I was confused and thought you were referencing the driveway. The Verandah is an expansion joint designed to move. I wouldn't use Concremate in it, and I wouldn't use a Shower Plug either. You should remove any deteriorated filler and go over the area with Sikaflex 11FC, a flexible filler designed for expansion gaps. This will also seal your leak if the joint is where the moisture is coming from.

After the Sikaflexx has cured you can paint over the area.

Mitchell

[approachmhn]

Thanks @MitchellMc .

Looks easy now. I will try this weekend when rain gives sometime.

last time I used a marine sealant (https://www.bunnings.com.au/selleys-410g-black-marineflex-sealant-black_p1230182) .

It was good in winter and gave up during summer in last few days. Hope this one is fine for hot and cold days.

[approachmhn]

Hi @MitchellMc , @EricL 

can I Apply  CPC 1L Shower Plug Sealant all over the area of my verandah?

verandah is already painted in charcoal colour. Will it not peel affect the paint.

also, will the sealant can endure hot and cold climate outside.

Thanks

[JacobZ]

Hi @approachmhn,

Unfortunately, CPC Shower Plug Sealant is not suitable for use over painted surfaces. This is because it is a penetrative sealer, and paint will stop it from being able to penetrate through the pores of the concrete. Some more information can be found on CPC's website.

The Sikaflex 11FC that @MitchellMc has mentioned above is a flexible sealant that is often used in expansion joints such as yours. It is used in external applications where no protection from weather is provided and a variety of temperatures, so it is perfect for your situation.

Check out How to fill a joint in a concrete slab where I've used Sikaflex 11FC to fill a gap between two concrete slabs in my shed. It is exposed to both high and low temperatures as well as water and there are absolutely no issues so far.  

Let me know if you have any further questions.

Jacob

[approachmhn]

Thanks for the clarification @JacobZ.