Welcome Guest ( Log In | Register )

Outline · [ Standard ] · Linear+

 Hacking prefab/precast concrete walls, How? Possible?

views
     
SUSceo684
post Dec 21 2020, 02:14 AM

Component Burner
********
All Stars
11,667 posts

Joined: Jan 2003
From: Klang/Subang




QUOTE(boyan @ Dec 20 2020, 09:19 PM)
Meaning which precast concrete walls are safe to hack?

Or are those walls actually brick walls (which would be safe anyway)?

But yeah, it would be helpful to get that! I guess I'll need to inquire more.
*
Generally the RC wall are the ones forming the skeleton. The rest will be filled in later with bricks/AAC blocks.
Attached Image

Brickwalls sometimes even have airgap on the top so its not supporting anything useful.

Your developer should be able to advise which are RC and which are non RC in the layout plan.
Newer condos use RC structural wall for speed of construction.

This is important if you need to hack to add new power sockets/other pipe runs.

Old condos (low density) built like a double storey house on steroids/shoplot style usually just avoid the beams and columns only as majority brickwall.
SUSceo684
post Dec 22 2020, 12:12 AM

Component Burner
********
All Stars
11,667 posts

Joined: Jan 2003
From: Klang/Subang




QUOTE(boyan @ Dec 21 2020, 07:54 AM)
Wow. How was it when it comes to renovation (effort, cost, contractor willing to do the job etc) e.g

- drilling in to hang fixtures
- hacking to make way for additional power point wiring
- fully demolish a wall to make way for bigger kitchen / room

Thanks!
*
- drilling in to hang fixtures
Small job for couple hundred bucks will be hard to get people to do. In terms of economic sense 90% of other jobs make more money so might as well get a rotary hammer and DIY.

- hacking to make way for additional power point wiring
depending on the scope. if just hacking out one more socket 3x3 next to existing one still can DIY.
chasing if short runs under 2m can DIY with rotary hammer + chisel. then need to get cement adhesive (susu) + cement mortar to fill the chase.
if full house runs better to do it with zero furniture as all these will create a lot of dust when drilling and chiseling and some grinder edits.

- fully demolish a wall to make way for bigger kitchen / room
proper demo hammer will do it fast (Hilti and up) laugh.gif
china machine take a bit longer but its just a wall, not those sewage concrete box or LRT track sections so still doable, but the china machine is waste of time for deep coring usage.

This post has been edited by ceo684: Dec 22 2020, 12:12 AM
SUSceo684
post Dec 22 2020, 01:19 PM

Component Burner
********
All Stars
11,667 posts

Joined: Jan 2003
From: Klang/Subang




QUOTE(boyan @ Dec 22 2020, 10:24 AM)
Not much of a DIY person when it comes to large projects, but yeah I guess I definitely need to upgrade my hammer drill to rotary hammer now.  bruce.gif
For big ones, I'm gonna plan it all out during reno prior to moving in. Just a bit apprehensive in case contractors slay me with huge bill due to having to work with existing precast concrete.  sad.gif
*
https://www.12rent.my/pd-bosch-gsh-3-e-demo...hammer-650w.cfm
it should be ok but the only thing hacking off walls need time to do, so if you want to save on their removal labour you can try your hand at smashing the walls because it just need someone to operate (with proper PPE - face shield and mask of course)

SUSceo684
post Jun 30 2021, 02:23 PM

Component Burner
********
All Stars
11,667 posts

Joined: Jan 2003
From: Klang/Subang




QUOTE(boyan @ Jun 30 2021, 01:04 PM)
I'm more curious about the structural integrity part first. In normal houses (RC beams and columns with brick walls) - ideally those walls marked red can be torn down without any issue.

I have no idea when it comes to houses built using prefab concrete panels.

If it cannot be done without seriously affecting the structural integrity - requiring me to effectively build new beams + columns to support existing floor as I tear down the walls (basically more complications than normal), then I might not go for it and just set aside the money for something else.
*
From the plan n construction technique it may not be possible to delete the rc wall as it appear to be structural wall ie load bearing for the slab itself. And due to RC it doesnt stick like glue, if want to modify need to add supporting wall on the below ie new walls and u need to pour new slab for the whole back room again because concrete doesnt stick to old one.
SUSceo684
post Jun 30 2021, 09:28 PM

Component Burner
********
All Stars
11,667 posts

Joined: Jan 2003
From: Klang/Subang




QUOTE(boyan @ Jun 30 2021, 09:07 PM)
All good points!

Thanks! I'm slowly (but reluctantly) accepting the fact that I might not be able to demolish any of the walls (urghhhhhhhh!). I guess it's a good reminder to anyone to carefully check the walls specification especially if one has lofty ideas of renovating further.
*
As your walls are ALL RC, to drill wall plug holes, recommended to use a rotary hammer as impact drills meant for brickwalls will suffer like a kancil pulling a container (TEU) laugh.gif

 

Change to:
| Lo-Fi Version
0.0169sec    0.34    7 queries    GZIP Disabled
Time is now: 13th December 2025 - 07:29 AM