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Catnic Lintel Installation - DPC & Drip Holes In Mortar?


 
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EViS

from United Kingdom

Joined: 15 Jul 2008
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PostPosted: Tue Jan 15, 2013 8:02 pm Reply with quote

Is this the correct way to install a catnic lintel? Or are the DPC and 'drip holes' unnecessary? Anything else which should be included as part of a installation?



Last edited by EViS on Tue Jan 15, 2013 8:37 pm, edited 1 time in total
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stuart45

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PostPosted: Tue Jan 15, 2013 8:05 pm Reply with quote

Weep holes go in the perps.
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noseall

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PostPosted: Tue Jan 15, 2013 8:10 pm Reply with quote

Erm....your (lower) image is showing bricks UNDER the whole lintel.

There are no bricks under the lintel only under the bearing ends.
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EViS

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PostPosted: Tue Jan 15, 2013 8:34 pm Reply with quote

noseall wrote:
Erm....your (lower) image is showing bricks UNDER the whole lintel.

There are no bricks under the lintel only under the bearing ends.


Haha! Yes, I got carried away with the copy and pasting icon_mrgreen.gif. Have now edited.
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EViS

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PostPosted: Tue Jan 15, 2013 8:41 pm Reply with quote

stuart45 wrote:
Weep holes go in the perps.

Should they be the entire height of the perp? And how common is it to use weep vents such as these?



That shows 'mortar thickness', so unsure how they are used in conjunction with a brick facade, or a rendered one for that matter as surely the rendered wall will have lots of small holes all over the place.
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limerockconstruction

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PostPosted: Tue Jan 15, 2013 9:35 pm Reply with quote

The type you show is fine, but there are also manufacturers who do the full height of the perp sizes as well, thats what my local merchants sell.

You sit them flush with the front of the brickwork - it may look a little odd if your looking hard, but it looks much nicer than a puddle in the cavity!

As for the holes in the render, same thing really, they end up pretty flush with the front of the render, and only in certain places, ie over windows and doors where your attention is much more drawn to the item under the lintel as opposed to the vents above!
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^woody^

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PostPosted: Tue Jan 15, 2013 10:08 pm Reply with quote

Plastic weep holes are marketing gold.

How they have managed to persuade people to buy and use these is amazing.

Leaving a joint out is obviously not good enough. Never mind the fact that moisture seeps out around the outside of the plastic weep holes, between it and the brick or lintel it sits on!
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EViS

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Joined: 15 Jul 2008
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Location: United Kingdom

PostPosted: Tue Jan 15, 2013 10:14 pm Reply with quote

Ok, I see that how you finish a weep hole is arguable, but good to know that one is recommended.

Should a weep hole be created at each far end of a lintel? Slightly inwards? Or should there be more than two (depending on the lintel length) and spaced 'x' mm apart?


Last edited by EViS on Tue Jan 15, 2013 10:31 pm, edited 1 time in total
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limerockconstruction

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PostPosted: Tue Jan 15, 2013 10:21 pm Reply with quote

depends on the size of the opening....I think regs say 900mm, but I would still have two even on a smaller opening.
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