A Deeper Dive Behind Parapet Walls

Roger digs deeper into the pros and cons of parapet walls.

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#ParapetWalls #FlatRoof #Parapet

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[happygolucky]

I’m reading a fantasy novel and a parapet wall was mentioned so I had to look it up. Thanks for the amazing insight!

[logik.]

I had no issues understanding the first video but nice that you reiterated it.

[jaewokG]

I live in the American Northeast in a neighborhood of 19th century brick townhouses [parapets are a common feature] and where we go from below freezing winters to steaming humid summers [-15c to 35c] and folks have spent the last few decades stuffing up insulation and sealing cracks and these 'damp lines' are rampant.

[amazing]

Excellent graphics there Skillbuilder, these types of drawings make more sense for people to understand, and Roger can throw his pens away.👏👏👏

[chriswitz]

Thanks for explaining this! I've had this problem numerous times over the years and now that I think of it, yeah...always at the chimney or bellow a parapet.

[contessa.adella]

The comment about condensation on a cold chimney breast is spot on exactly what happened in my mother’s old house….She had a repair chap rambling on about flashing and sealing etc, but you could see the ceiling water stain coincided with a change in chimney profile in the loft. Condensation was running down the outside of the rendered chimney brickwork in the loft and dripping off at the curve to wet the ceiling board under it. I guess it only occurred on cool summer nights when the fire was not lit. This is hard to fix, but one way is to install a collection trough under the drip zone and pipe the run off to an outside wall or under the eves harmlessly discharging the condensation.

[BlackstoneArchitecture-qu]

If the block to the interior of the parapet is an open cell variety you could fill the cells with perlite to help combat thermal bridging.

[memyself]

I had a bit of a giggle watching this, because, like a typical builder, at approximately 0.20, Roger says "this is a very quick video, won't take two minutes of your time."
The video then continues for another five minutes and eleven seconds!
That means this video lasted 16.6 times longer than he said it was going to.
It's a good job he wasn't quoting time for a new installation!
Only kidding, Roger.
I love to see your videos, they are brilliant.

[Swwils]

It might seem odd but you must remember heat loss can be material (like a steel wall tie) or geometric - in the case of a parapet the upstand acts like a cooling fin. The heat-emitting surface is larger than the heat-absorbing surface, just like any other corner. Hence why the heat break is important!

[MontyVideo]

Another great video as always Roger. We've got a 1st-floor balcony with parapet wall with capping stones which has rotten timbers (firrings and joists) around the perimeter under the OSB deck, especially under the internal corners.
You and your diagrams explain well "how it should have been done at the beginning". But that doesn't really help me in my pre-existing situation. Perhaps you could make a video about how to fix this system without the demolishing and rebuilding of the entire parapet. Roger that!

[adamlancaster]

Please more of these type of videos Roger,

[tinytonymaloney]

Should there be some form of vent at the top of the brickwork to allow flow of air and allow any moisture to evaporate??

[lukegadd]

Hi Roger, great video as always. I actually thought your original video on this very straightforward to understand. Was just after a detail on venting a flat roof with a parapet if you had any?

Thanks Luke

[mauriceshapero]

Another great video - thank you. What kind of insulation would you use to run through to connect to the wall insulation? I mean in terms of building block work on top of it - does it have to be anything special to support the block?

[kevinrae]

One thing I’d add is, take the membrane down the exterior wall a little bit, and ensure the cope is only there for decorative purposes .

[mooney]

Have you seen anyone doing the timber stud work on top of the insulation? I’ve got an upcoming extension with a parapet wall, I’m interested to know if this is a good method

[danday]

Great thank you made alot of sense however could you explain where you would take the vapour barrier

[Fourcupsofcoffee]

I'd love a video about how to properly do a chimney and the different types to prevent what you mention. In my property I was thinking about just pushing some insulation in to is to try and get it above the ceiling line then caping the top to prevent any rain getting in.

[richardphillips]

Hi Roger.
I would happy to send you my standard detail for parapets which does address the issues you have been highlighting.
Your videos are very informative, I’m always referring to them when discussing details with builders
Regards
Richard

[sergiofernandez]

Underneath the GRP they should use slate or cement board rather than OSB/chipboard wood which in time will absorb moisture. Great video Roger