[UncoonsKala]

Could it be wise to put some petroleo (alphate) on top of the old fiberglass and impermalizante with white gravel on top ??Thanks,

[CDCL7WKJ]

Inside my house. The roof is flat, and it gets hot as hell, I want to fix this issue. The roof was once coated with some white coating, but that has degraded, and it's expensive to replace that coating every 2 years, I want a more permanent solution, has anyone had this issue and resolved it?

i have given a lot of thought to this,.. and have a lot of experience in housing .. having restored 5 old houses in the States... but.. I have not done this here and so am just speaking of what would work

In LT ... and by far the cheapest thing is to just build a small roof peaked... and then the question is how to vent the hot air out from the celing. In the States we have attics traditionally and fans which vent out. Put a good venting fan heading OUT in the highest window opening available

Then the deluxe version is to build wooden slats of some sort over the roof and make it a greenhouse. as in just shade cloth over your tomatoes, eggplants, carrots, spinach, lettuce

which... along with the downspout installed to fill your rain barrels....

will double the size of your home

once you put in sexy spiral staircase and the lounge beds for seeing the night stars..and the tiki lights

you will find that the place is far too nice for you to live in and you will have to rent it out to intrepid tourists

and find a new place to live

on the second floor of a three story house with a balcony

[CDCL7WKJ]

picks.... why do you not ask in a FLORIDA forum like city county data

rather than a DR forum

since the house in question is in FLorida... is it not?

we can do things here that you cannot--.-

just confusing that is all.... i was all up about the roof garden

florida was just built wrong

[PaulRyansew]

The smaller the pebbles the better! The heat gets less retained and dissipates faster during the nights cool down.

And let me tell you: This is a one in a time investment that needs NO maintenance or upkeep at all, just using some bleach on the water once in a while will keep them white and free of mold/green stuff, or best weedkiller...

And the best part is that you can do it yourself, with a minor help to place the sacks on the roof...

How thick is your gravel layer Pichardo? If too thick you might have loads issues on your roof, no?

Barnabé

[Tuqofiw]

Inside my house. The roof is flat, and it gets hot as hell, I want to fix this issue. The roof was once coated with some white coating, but that has degraded, and it's expensive to replace that coating every 2 years, I want a more permanent solution, has anyone had this issue and resolved it?

I have the exact same problem - live on the top floor and the roof is flat, red colored tiles. My neighbors side has some kind of raised sealant but my side is just the tiles - hence it gets like an oven inside at times.

This is a rental so I don't want to expend a huge amount of money - are there any paint like options to reflect back the heat? I'm wondering if just painting the roof tiles glossy white would help?
Thoughts anyone?

Karlheinz

[OShellszz]

I have the exact same problem - live on the top floor and the roof is flat, red colored tiles. My neighbors side has some kind of raised sealant but my side is just the tiles - hence it gets like an oven inside at times.

This is a rental so I don't want to expend a huge amount of money - are there any paint like options to reflect back the heat? I'm wondering if just painting the roof tiles glossy white would help?
Thoughts anyone?

Karlheinz

Yes, there is a type of paint made for that purpose, it costs $5000 per five gallon jug, and for a roof like mine it would take 4 jugs to cover it, and it would need to be replaced every two years.

[soprofaxel]

I have the exact same problem - live on the top floor and the roof is flat, red colored tiles. My neighbors side has some kind of raised sealant but my side is just the tiles - hence it gets like an oven inside at times.

This is a rental so I don't want to expend a huge amount of money - are there any paint like options to reflect back the heat? I'm wondering if just painting the roof tiles glossy white would help?
Thoughts anyone?

Karlheinz

If I were you, I'd make sure the owner signs off on you painting the roof tiles white. That may not go over too well with them.

[Khcyhshq]

How thick is your gravel layer Pichardo? If too thick you might have loads issues on your roof, no?

Barnabé

At fist we used the cheap and big chunks type of gravel, not white nor was it light. The layer came about 3 inches + thick with that one and the roof was Ok with the added load.

After learning from trial and errors (three times, three different types of gravel material/pebble sizes), I found that the small sized whitest pebbles did the best job of all. The end layer was about no more than 2 1/2 inches thick at the bumps and averaged some 1 1/2 around the whole area. The cooling factor was increased by a factor of 3 and the dampness retained during the heat waves after intentional sprinklings was excellent.

It took me a while to get the correct material/sized gravilla.

The load is spread on the roof, so the added weight is of little issue to 99% of concrete slabs, unless you have plenty of air pockets in yours due to poor mixture, high alkali and cut corners during the construction process.

Somebody (with a commercial structure using the same application) told me to do like him, and use a sprinkler system atop the roof to keep the gravel damp automatically during the hottest waves. He modified the timer for the sprinklers with a mercury cut off/on switch that allows the system to activate when needed using rain water collected in several tanks on the down spouts. I checked the thing up, but I find that the investment pays off for a large scale thing like his, not a mere home roof like our property. Plus I liked to go atop the roof and wet it using garden house (It feels kind of therapeutic).

[wpFWNoIt]

I think a cost-effective way to deal with it would be to put a low-pitched second corrugated roof above the existing one with space underneath so that the heated space can vent to the top of the roof line. Leave a gap at the top for the hot air to vent out.

If the roof is sturdy, another option would be to make it into a terrace with planters to suck up the heat.

I've also seen the sprinkler systems on other roofs. Sometime it was just a hose with a bunch of holes poked into it.

[OShellszz]

So how much gravel would be needed for a 100m sq roof? And how much does the gravel cost per ton?

[Phlkxkbh]

So how much gravel would be needed for a 100m sq roof? And how much does the gravel cost per ton?

It is probably sold by the Cubic yard

[Shiplyopidomi]

Try Palm leaves dude cheaper and it works keeps the place cool, whenever the house is hot during the xtreme summer heat all i do is walk over to my wooden cabana and ly in my Hamak its so cool under there cuz we had the roof done with palm leaves.

[Khcyhshq]

So how much gravel would be needed for a 100m sq roof? And how much does the gravel cost per ton?

The ones we got came in bags, already sorted and packed. We got them from a contractor that we met in Punta Cana back then. I saw them using the white small pebbles in a project close to ours, and asked the workers for the supplier but they just called him for me outside. He sold me the bags and had them placed by the workers the next day. To be honest I don't even remember the exact price of the bags, because he did some other work as well and rounded up the price for all of it.

But it was cheaper than the gravilla that I got from the local supplier that was useless, or at least not as useful as this one.

[OShellszz]

I called Ochoa, they do not carry white gravel, and the person I spoke with doesn't know where I could get it.

[soprofaxel]

I called Ochoa, they do not carry white gravel, and the person I spoke with doesn't know where I could get it.

You'll do better checking with the local "Viveros" (Nurseries), The white gravel is more of a "decorative" thing.

[PaulRyansew]

I called Ochoa, they do not carry white gravel, and the person I spoke with doesn't know where I could get it.

If I looked for that, I would:
- PM a poster on DR1, dms3611, who knows more than you need about aggregates in DR. I don't know if he is still active on the board.
- simply enough, stop by one of these street vendors for building stones. I already purchased white pebbles from them (bags, to truck load). They should probably be able to locate white gravel, if it's on sale in the DR
- call of the mines, or visit them, be it for instance in San Cristobal (El Pomier) or Boca Chica

Barnabé

[PaulRyansew]

CEMEX REPÚBLICA DOMINICANA | MULTIPRODUCTOS | Agregados | Grava

Barnabé

[Anavaralo]

Gravilla is the way to go, since adding anything atop the roof will be asking for a sure to come problem when storms come about, pests, mold, thieves, etc...

What do you think they use in large commercial roofs with concrete?

You can leave a small channel (gap line) in some sections that follow the designed concrete's slab drain pattern, in order to have excess water removed when it rains to avoid leaks due to filtration.

The gravilla acts as a natural insulator for the home, both for the cold and hot temperatures. It limits the exchange of the air inside and outside via thermal transfer by trapping air in bubbles that act like mini insulators. When the day time is very hot, the white gravilla reflects most of the solar heat away, and what's left of it after the sun goes down will act as coolers when the gravilla damp their surface due to the cooler air.

Like I said (and is done in commercial roofs) you can wet the roof when it's very hot to create a rapid exchange of temperature from the gravilla and cool the house even more during the hot streaks.

It's highly recommended to AVOID building a new roof line above a concrete slab, because the normal heat exchange is disrupted and will cause mold and other problems to the concrete roof.

Mold accelerates the decay of the salt-oxides in the concrete and also can infiltrate the pores all the way inside the house.

I lived in a place last december in Puerto Plata which had a metal roof over the original concrete one, Mold spores galore I coughed all the time I lived there.
Der Fish