www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Roof treatment by Brick Coba

 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
sspawar
...
...


Joined: 05 Jun 2009
Posts: 1175

PostPosted: Wed Jul 15, 2020 3:50 am    Post subject: Roof treatment by Brick Coba Reply with quote

Dear Sirs,
We have a 60 m by 10 M BUILDING RCC roof.
Once a layer of 75 mm screed with some market available waterproof product and methodology has been done but it did work and now Brick coba of 100 mm thick is being suggested over screed surface.
Is it work there.
load of coba is not concerned.
Is there any other alternate without breaking the screed layer already laid over RCC slab of average 75 mm thick.
Thanks in advance.
Regards
Back to top
View user's profile Send private message
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1352
Location: Cochin

PostPosted: Thu Jul 16, 2020 2:40 am    Post subject: Reply with quote

Do you experience leakage through the existing screed ? Why cannot you try membrane waterproofing such as APP and the like, which will not impose much additional deal load on the roof ? APP item  is incorporated in the CPWD Delhi Schedule of Rates (DSR) also. Of the many brands dealing with APP, the Data Sheet of one brand is enclosed, for guidance.

E S Jayakumar



Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.
wp_shield_103_p.pdf
 Description:

Download
 Filename:  wp_shield_103_p.pdf
 Filesize:  118.35 KB
 Downloaded:  68 Time(s)

Back to top
View user's profile Send private message
suraj
General Sponsor
General Sponsor


Joined: 17 Apr 2008
Posts: 2195
Location: NCR Faridabad, E mail suraj_engineer@yahoo.co.uk

PostPosted: Thu Jul 16, 2020 11:29 am    Post subject: Re: Roof treatment by Brick Coba Reply with quote

How many rainwater outlets/gargoyles have been installed?
What gradient to roofing allowed? It should be 1.5 to 2%
Minimum 50 to 75 mm depending on materials
Why was Foam Concrete not tried?
Use Tapecrete coating in 2 or 3 coats & then overlay with lighter concrete in slope


sspawar wrote:
Dear Sirs,
We have a 60 m by 10 M BUILDING RCC roof.
Once a layer of 75 mm screed with some market available waterproof product and methodology has been done but it did work and now Brick coba of 100 mm thick is being suggested over screed surface.
Is it work there.
load of coba is not concerned.
Is there any other alternate without breaking the screed layer already laid over RCC slab of average 75 mm thick.
Thanks in advance.
Regards
Back to top
View user's profile Send private message Visit poster's website
sspawar
...
...


Joined: 05 Jun 2009
Posts: 1175

PostPosted: Fri Jul 17, 2020 5:57 pm    Post subject: Reply with quote

Yaa it was proposed from contractors side but some past experienced seniors have rejected the proposal saying in long term after getting heat the membrane (sheets) get split out from roof surface and form air bubble spaces which cause leakages again.
Can you give some name of works where it majorly used and resulting good in long terms i.e. 5 years or so.
What is your experience , how it behave in summer days.
Thanks and regards

es_jayakumar wrote:
Do you experience leakage through the existing screed ? Why cannot you try membrane waterproofing such as APP and the like, which will not impose much additional deal load on the roof ? APP item  is incorporated in the CPWD Delhi Schedule of Rates (DSR) also. Of the many brands dealing with APP, the Data Sheet of one brand is enclosed, for guidance.

E S Jayakumar
Back to top
View user's profile Send private message
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1352
Location: Cochin

PostPosted: Sun Jul 19, 2020 5:42 am    Post subject: Reply with quote

As per my experience, APP will endure for more than 5 years, if properly laid with quality material. It is possible that high atmospheric temperature may affect its durability thereafter. If the substrate is not enough stiff, and it is likely develop soft pockets here and there, use of such flexible membranes is advisable. Alternatively, waterproofing chemicals can be applied over the substrate, if found stiff, and the same has to be protected with rich cement plaster, to avoid abrasion. In any case, minimum slope to drain off rain water has to be maintained for the treated surface.

E S Jayakumar
Back to top
View user's profile Send private message
Binoy Bhuson Saha
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2009
Posts: 27

PostPosted: Tue Jul 21, 2020 4:30 pm    Post subject: Roof treatment by Brick Coba Reply with quote

May be try for foam concrete.

Posted via Email
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy