Thoughts on this use of mastic

[wgeorge]

A roofer was tasked with fixing a missing tile which seems to be ok but then added this white mastic on the 126 year old chimney. I just wanted to hear what other roofers thought about it. 

[Redbeard]

Hmmm. I'd like them to show me it was roofing mastic designed for 'pointing' lead. I have never seen that in white. Even if it is not it may 'behave' OK but it is the wrong horse for the course.

 

Is the scaff still there? Sad if not. It would take 30 mins max including climbing to sort it now. 99% of passers-by will not notice it but I suspect you will, and it will annoy you. Given that they appear to have used 'Leadmate' below I guess it may just be a case of having the wrong stuff in the gun and using it anyway. I am not a roofer, BTW.

[Onoff]

Sorry but that looks like a quick bodge. 

 

Just had my roof done on an 1863 cottage. I'll let picture show the difference. Re-mortared (though probably not lime based as original):

 

 

I have used buff coloured silicone mind, where my sliding gate posts project from the brick pillars. (This so the gate moving etc doesn't impact the pillar as much as if it were solid mortared). That would have been better than the white your lot used but still not right. 

 

 

This is what I used:

 

https://www.toolstation.com/silicone-825/p93228

 

[Marvin]

Shame.

 

Easily available: lead sealant in lead colour. 

 

 

[wgeorge]

Thanks for the replies. Scaff is still up. I’m also disappointed with the way the mastic seems to have been finger wiped over the bricks 

[Onoff]

This will likely remove the silicone from the bricks. Worked for me when I made a mess:

 

 

 

[Iceverge]

Send them back up to fix it. 

 

 

https://youtu.be/b_ZeJqNt4Hk?si=CsfA58HZh5gIzlYe

[BotusBuild]

  On 29/03/2025 at 21:37, Iceverge said:

Send them back up to fix it.

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+1

 

use the right sealant and clean up the finger wipes at the same time

Edited March 30 by BotusBuild

[Redbeard]

  On 29/03/2025 at 18:44, wgeorge said:

Thanks for the replies. Scaff is still up. I’m also disappointed with the way the mastic seems to have been finger wiped over the bricks 

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I forgot to mention that. Maybe it's a basic H & S measure - glue your left glove to the stack with silicone while you use more of the same stuff to make a right mess just below...? (Remember not to take hand out of glove).