INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

TEMPORARY ROOF DECK WATERPROOFING

TEMPORARY ROOF DECK WATERPROOFING

(OP)
A friend is going to build the ground floor of this two-storey residential bldg and the second storey will be left for several months before continuation. The second storey concrete slab will temporarily serve as roof deck for certain period.
How do we prevent rain water from seeping into the temporary roof deck and reaching the ceiling?

Thanks so much.

-R

RE: TEMPORARY ROOF DECK WATERPROOFING

Suggest you build a roof over it as concrete is not waterproof.

RE: TEMPORARY ROOF DECK WATERPROOFING

Hi gotlboys,

Size? Climatic conditions?(frost, ice, snow, windforce?)

As bimr :Construct a roof. Suggestion: plastic tarpaulin, self-draining mounted, tight stretched, secured against wind, over steel or timber construction for instance of rented steel-scaffold parts.

RE: TEMPORARY ROOF DECK WATERPROOFING

(OP)
Thanks so much Bimr and Gerhardl.

It is 8.5m x 13m residential bldg. I am in South East Asia, a tropical country; no snow and ice. Some suggested making the temporary RC slab slant of 3% and provide downspout to drain the rainwater. I don't know if it works well as what you suggest.

RE: TEMPORARY ROOF DECK WATERPROOFING

A RC slab is not waterproof, even with a 3% pitch.

You should install plastic sheeting such as a UV resistant HDPE over the concrete.

RE: TEMPORARY ROOF DECK WATERPROOFING

a properly designed and constructed concrete slab could be nearly water tight and with adequate drainage, it would reduce the seepage down to a very low rate. the top surface could be waterproofed with a membrane / coating which would greatly improve things. If not, then humidity in the bottom level will be high. when you finish the building you will want to level the floor which will take time and money to complete. you might want more than 3% slope to prevent any low spots that might not completely drain off.

RE: TEMPORARY ROOF DECK WATERPROOFING

I still think an external, temporary wooden or steel frame with a tightly stretched plastic (reinforced) sheeting and a fall of say 15 deg. both sides from top along midroof would be best. Let original roof surface be as is, but in addition protect either with impregnation (water-glass, water resistant/repellent but not 100%,) or other layers simple to build onto later.

The best solution is not the cheapest now, but the safest and one not likely to cost you repairs or additional maintenance later.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close