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K-DBMCore Details

Basement and Below-Grade Wall Details

Below-grade walls against water that never takes a day off.

Start chapter 1 freeEnrol in this course
M.A.T. (MUKA AIR TANAH)250300-3.450FFL BASEMENTMEMBRAN HDPE 1.2MM PRE-APPLIEDMENERUS DINDING–BAWAH RAFTPAPAN PELINDUNG 3MMDRAINAGE CELL 20MM+ GEOTEKSTILTANAH URUG DIPADATKANLAPIS 200, 95% PROCTORPIPA HDPE BERLUBANG Ø110+ KERIKIL Ø20–40 + GEOTEKSTILLANTAI KERJA K-100 T.50PASIR URUG DIPADATKAN T.100DINDING BASEMENT T.250BETON K-350 KEDAP AIRACIAN + CAT EPOXYWATERSTOP PVC 150DI SIAR COR RAFT–DINDINGSCREED T.50 + EPOXY 3MMRAFT BETON T.300TULANGAN LIHAT GAMBAR STR.ILUSTRASI CONTOHBUKAN UNTUK KONSTRUKSI1K-DBMBASEMENT AND BELOW-GRADE WALL DETAILSSKALA 1:10
Level
Advanced
Lessons
18
Time
1h 55m
Rating
4.7
Learners
6.2K
Updated
Aug 2026

After this course

What you'll be able to do yourself.

Below the water table, water pushes on walls and raft day and night. This course covers hydrostatic pressure, tanking, crystalline concrete, external drainage, waterstops and the order of work on site. Basement repairs are expensive, so the right decisions have to be on the drawing.

  1. 1Calculate water pressure on walls and uplift under the raft.
  2. 2Compare membrane tanking and crystalline concrete for a given project.
  3. 3Draw a basement wall section with membrane, drainage and waterstop.
  4. 4Set construction joint positions and pick the right waterstop.
  5. 5Sequence the work from dewatering to backfill.

Good for

  • Architects and drafters starting on buildings with basements.
  • Site supervisors on below-grade work.
  • Young engineers who want to see basements from the waterproofing side.

Best taken after

Full syllabus

Chapter by chapter, nothing hidden.

18 lessons, 1h 55m in total. Chapter 1 is open to everyone.

Chapter 1Ground water never takes a day offFreePressure, uplift and how to think about a basement.6 lessons / 38 min
  1. Pressure from three sides5 min
  2. Below-grade words4 min
  3. Work out pressure and uplift7 min
  4. Stack the basement wall6 min
  5. Do not switch the pump off yet6 min
  6. Chapter 1 test10 min
Chapter 2Tanking, crystalline and drainageThree ways to face water, and when to use which.6 lessons / 37 min
  1. Tanking: wrap it from outside5 min
  2. Crystalline and drainage5 min
  3. Slide the basement parameters5 min
  4. Find the faults in the basement6 min
  5. Membrane torn during backfill6 min
  6. Chapter 2 test10 min
Chapter 3Construction joints and work sequenceBasements fail at the joints. The sequence decides everything.6 lessons / 40 min
  1. Waterstops at construction joints5 min
  2. Draw the basement wall8 min
  3. Read the basement in 3D6 min
  4. Sequence and repairs5 min
  5. Seepage at the joint6 min
  6. Chapter 3 test10 min

Lesson kinds

  • Concept
  • Glossary
  • Calculate
  • Layer Stack
  • Site case
  • Chapter test
  • Slide the Parameter
  • Spot the Fault
  • Draw the detail
  • Read a model

Get a feel for it

You practise, you don't just watch.

Try it: Slide the ParameterIllustration, not for construction
M.A.T. (MUKA AIR TANAH)250300-3.450FFL BASEMENTMEMBRAN HDPE 1.2MM PRE-APPLIEDMENERUS DINDING–BAWAH RAFTPAPAN PELINDUNG 3MMDRAINAGE CELL 20MM+ GEOTEKSTILTANAH URUG DIPADATKANLAPIS 200, 95% PROCTORPIPA HDPE BERLUBANG Ø110+ KERIKIL Ø20–40 + GEOTEKSTILLANTAI KERJA K-100 T.50PASIR URUG DIPADATKAN T.100DINDING BASEMENT T.250BETON K-350 KEDAP AIRACIAN + CAT EPOXYWATERSTOP PVC 150DI SIAR COR RAFT–DINDINGSCREED T.50 + EPOXY 3MMRAFT BETON T.300TULANGAN LIHAT GAMBAR STR.

Slide the value. The drawing follows, just like in the lessons.

Water pressure at the base of the wall is about 6 kPa. The higher the water table, the harder it pushes on the joints.

Illustration, not for construction

Your creator

Taught by someone who still does the work.

Your creator

Sekar Anindita

Site architect

A practitioner who teaches from their everyday work.

Courses
4
Learners
40.6K

Other courses

About becoming a creator

Learner reviews

From people who took it.

4.7out of 5

590 reviews

  • 572%
  • 420%
  • 36%
  • 21%
  • 11%

  • Bagas Wicaksono

    Junior quantity surveyor

    Layer Stack made the waterproofing build-up stick in my head. It lands better than watching a video.

  • Salsa Rahmadani

    Junior drafter

    I once got a complaint about a leak in a second-floor toilet. Now I know which point to check first.

  • Rizal Maulana

    Site supervisor

    The parapet detail is simple but right on target. My senior asked where I learned it.

Questions that come up

About this course.

All questions

01

What can I try for free?

All of chapter 1, "Ground water never takes a day off": 6 lessons, about 38 min. No card needed. If it isn't for you, stop there.

02

What should I know before starting?

It helps to have finished Roof and Parapet Details, Wet Area Details first. It isn't locked, but the chapters assume you know that material.

03

Subscribe or buy this course?

Pro is Rp149.000 a month and opens every course, track, exam and certificate. Buying this course is Rp399.000 once and it stays yours. If you plan to take more than two courses, Pro usually comes out cheaper.

04

Do I get a certificate?

Certificates come from track exams, not single courses. This course counts toward Core Details, Junior Architect. The exam runs 60 minutes and you pass at 75 percent.

05

Can I use these drawings on a project?

No. Every drawing in the course is an illustration for learning, not for construction. Use them to understand the logic, then follow your firm's standard and your engineer's drawings.

Part of

This course counts toward these tracks.

Where next

Courses people often take next.

All courses
  • datFlagship

    Core Details / Beginner

    Roof and Parapet Details

    Roof edges that stay dry, from the sheet to the site.

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    Lessons
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    Time
    2h 55m
    Rating
    4.9
    Learners
    36.4K
  • dbs

    Core Details / Intermediate

    Wet Area Details

    Bathrooms that do not drip onto the ceiling below.

    Nara Wijayakusuma
    Lessons
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    Time
    1h 58m
    Rating
    4.8
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K-DBMStart with chapter 1

Basement and Below-Grade Wall Details free.

No card needed. If it suits you, go on with Pro or buy this course.

Start chapter 1 freeSee plans, Rp149.000