[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

View post   
File: 116 KB, 669x503, 4.jpg [View same] [iqdb] [saucenao] [google]
2396353 No.2396353 [Reply] [Original]

What was the point of sticking rocks to a roof with tar?

>> No.2396355

1. snow doesn't crash on your head and kill you
2. you can walk on it when something up top needs maintenance

>> No.2396357

>>2396353
to keep them from rolling away, duh

>> No.2396358

Lessen solar heat gain of black tar that makes it soft and sticky so it traps leaves and bugs and sticks to anyone who has to go up there
Lessen risk of damaging layers underneath when working up there
Weight helps keep layers underneath compressed and resistant to peeling/separating

>> No.2396369

>>2396355
1 is not an issue with an incline shingled roof. 2 isnt an issue either because anyone who isnt wheelchair bound can easily scale an incline roof.

>>2396358
And also UV protection.

>> No.2396370

It protects the waterproofing, mostly from UV but also from small dropped objects and you can walk on it. It's a trash tier roof.

>> No.2396383

>>2396370
>It's a trash tier roof.

I don't know the current status, but back when I was a young whippersnapper it was used on every building with a flat top, and was a very high quality roof when done right. You could specify cheap insulation or good insulation, one, two, or three layers of tar paper of varying weights. It seemed like the tar and gravel was always the same; hardest fucking job I ever did, by far.

>> No.2396398

Something to do with snow or something like that
I live in the tropics

>> No.2396403

Roofs are getting very expensive. Time for this low tech to make a comeback.

>> No.2396424

>>2396369
>1 is not an issue with an incline shingled roof
https://www.youtube.com/watch?v=YQDi6x6OPXA

>> No.2396501

>>2396353
It's meant as a wearing surface so that the felt and liner that's actually keeping water from seeping through the roof doesn't get ripped up from some branches, birds, animals, etc. or when people go up to the roof to service equipment.

>> No.2396512

>>2396383
The key word is flat roofs. They always started leaking unlees they actually have a proper incline. And they rarely do.

>> No.2396514

>>2396383
They always leak. That tar ain't fucking water proof as you'd think. Shit dissolves in water. Slowly over years. But it does.

>> No.2396533
File: 136 KB, 820x571, Screenshot_2022-05-31_18-21-11.png [View same] [iqdb] [saucenao] [google]
2396533

>>2396514
>That tar ain't fucking water proof as you'd think
on the actual legit office tower buildings like I was referring to, they actually DON'T leak. The tar glues the felt (tar paper) together, and if applied properly, doesn't leak.

One interesting bit of trivia. On the most expensive deals, it would call for three layers of felt. Now think about that. Do you do the entire roof once, then again, then again, providing three actual independent layers? Nope, their are a lot of lines on the felt showing how much to overlap for one, two or three layers, so you go across the roof one time, you just overlap different amounts. As a result, if one of the layers had a "fish mouth" that was bad enough, there would be a direct path through all three layers for water to get through. But highly trained professionals like our crew (an astonishing number were recent ex-cons; Baker had a deal with Central Prison or something) would repair the fishmouths before the final layer of tar and gravel went on.

>> No.2396621

Why do am*r*cans make their roofs out of such weird shit?
Fucking asphalt and plywood or whatever the fuck.
Just use tiles or steel sheeting you fucking retards.

>> No.2397082

>>2396621
The post war building boom let a lot of cheap building techniques be adopted.

>> No.2397089

>>2396533
>an astonishing number were recent ex-cons
If you were locked up, you'd want to be a roofer, too. You are outside all day with a great view.

>> No.2397123

>>2396533
It still dissolves. Doesn't matter how well it's installed.

>> No.2397616
File: 993 KB, 500x277, why do they call him Red when he's black.gif [View same] [iqdb] [saucenao] [google]
2397616

>>2397089

>> No.2397640

>>2397616
Filtered

>> No.2399395

>>2396355
>1. snow doesn't crash on your head and kill you
how is tar supposed to help against that?

>> No.2399403

>>2396353
that's an old, shitty and abused flat roof. they are done very different now, especially up north. you have to have an ice shield installed first, then a metal drip edge, prime the drip edge with ashphalt primer (its spray paint, basically) then use a 6 inch (we use 8 because it's better) strip of ice shield over the drulip edge all around. then you lay out the rolls of cap sheet and roll all seams twice. you also have to use the right caulk around pipes and install the large flash lead pipe boots on them too.
on shingle roofs we clean off all the old vent pipes and what not and paint em with black engine paint. really ties the roof together nicely
>t. roofer

>> No.2399404

>>2396424
that's a metal roof, not shingled.