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Will Brick acid damage a flat roof with felt and gravel?

Discussion in 'General DIY' started by darkan9el, 14 Jul 2018.

  1. darkan9el

    darkan9el

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    Hi all, I have a wall that is above a flat roof extension, the flat roof is felted and gravelled, I have to remove some very poor mortaring from the brickwork, the mortar will eventually need removing as it is a different colour to the rest of the mortar but for now all I have to do is remove the mortar on the bricks to tidy it up bit.

    Do I need to protect the felt or will the brick acid not react with the felt, I'll probably mask it up anyway but I just wanted to know what effect it may have etc.
     
  2. foxhole

    foxhole

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    You have to protect roof or you will have all the cwap removed mixed with gravel.
     
  3. darkan9el

    darkan9el

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    I have some old dust sheets I don't mind binning so I'll cover up with those, its not a big job but nevertheless don't want corrosion of the felt nor the bitumen.
     
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