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Details

Masonry Cavity Wall - Base Detail

11/23/2013

 
Group B
Exterior Masonry Cavity Walls consist of a weather-resistant exterior wythe of brick or stone or similar material and an inner wythe of concrete block. The cavity aids in preventing water penetration by draining any water out the base of the wall. 
Masonry backup of concrete block offers the advantage of being a load bearing structure, although it can be non-load bearing. The cavity can accommodate significant insulation with masonry mass on the interior. 
The key features of the detail are the:
  • continuous cavity vent that prevents mortar droppings from clogging the bottom of the cavity
  • masonry flashing to direct any moisture to the exterior
  • weep vent to let moisture out of the cavity and to equalize air pressure in the cavity with the outdoors (a similar vent is often placed at the top of the cavity)
  • identifying other components of the wall

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Details Of An Elevator Addition

11/18/2013

 
D-Services
Elevators have become necessary in almost every new building of two stories or more. Even without ADA requirements, society has come to expect elevators. When remodeling or expanding an existing building, adding an elevator can be a challenge. In new construction, an elevator is normally placed in a central location in the interior of the building. This can be very messy and complicated in an existing building, because of the need for a pit, structural modifications, and relocation of other utilities if they are in the way. For existing buildings it is more common to find a suitable location on the exterior to add the elevator as shown here. The exterior location may be more expensive because of the enclosure, but the interior location can be expensive too in an occupied building. 
The key issues of the elevator addition are: 
  • Pit depth versus existing footings to prevent undermining
  • Selecting the elevator cab size, speed, controls and finishes
  • Designing an enclosure that does not detract from the existing building
  • Coordination with electrical, HVAC and plumbing needs during design and construction - final inspections can take weeks after the elevator is ready

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SIDEWALK - CONCRETE WALKWAY PAVING

11/17/2013

 
Group G
Concrete sidewalks are the common way to pave walking paths, and there is nothing exotic about this detail. The main point is that a detail like this can cover all the requirements for the walkways rather than having a specification for that purpose.  See the Comments below.

The key features of the paving are the concrete itself, reinforced or plain, base or no base, style and spacing of joints, finishing and curing. The concrete should be air-entrained to resist freeze damage. Reinforcing does little more than keep the adjacent panels in alignment over time, but that does eliminate trip hazards. Finishing can be as simple as burlap dragged longitudinally with sawn contraction joints. Or you can develop patterns with jointing, staining and texturing. 

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Jambs and Heads - Door Jamb and Head Drywall Details

11/16/2013

 
Group C
Details of Door Jamb and Head Details in drywall construction are a good practice. In some simple projects they may not be required. However, by detailing the conditions, you create a basis for requiring the level of detail that the project should receive. 

These details are suggested to specify any special configuration, construction and materials required for the conditions required at the jambs and heads of door frames in drywall construction.

As you collect details of various conditions, it becomes a simple matter to include this information in the drawing set.


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Masonry Wall Section

11/10/2013

 
B-Shell
Exterior Masonry Walls normally consist of a cavity wall with a weather-resistant exterior wythe of brick or stone or similar material and an inner wythe of concrete block or structural metal studs. The cavity aids in preventing water penetration by draining any water out the base of the wall. 
Masonry backup of concrete block offers advantages of load bearing structure, as shown here, and a durable interior finish. The cavity can accommodate significant insulation with masonry mass on the interior. 
The key features of the section are the:
  • coordination of structure and exterior closure
  • establishing vertical heights
  • identifying the materials of the exterior closure
  • identifying auxiliary construction required, such as, drainage, backfill, waterproofing


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Trenches - Backfill and Compaction of Trenches

11/5/2013

 
Picture
What to do about trenches? When you let the contractor, or your engineer, decide what to do about trenches, the results can be troubling. Not immediately, but excessive settlement often telegraphs the presence of the trench a year or so later with a noticeable dip in the ground. Under pavement this will lead to early failure. Building floor slabs may take decades to fail, but the mess it causes is completely out of proportion to doing it right the first time. 
This type of detail sets a higher standard. Flowable fill means weak concrete that can be excavated with a backhoe. Properly backfilling a trench is labor-intensive to do it correctly, which is why it won't happen unless you are standing there and insisting on it. Flowable fill costs the same as properly backfilling and compacting - with the benefit of actually getting what you have paid for.

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Drywall Partition - Typical Drywall Partition

11/3/2013

 
C-Partitions
The Typical Drywall Partition Detail is useful as a way to cover the standards that are expected for drywall partitions. By showing the standard case, only the exceptions to the standard need to be addressed on the drawings. When the detail shows the typical drywall thickness, drywall type, stud material, dimensions, spacing, and anchorage it simplifies access to that information for everyone and it simplifies what needs to be covered in the specifications - just state "see drawings".


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Infill - Partition Infill at Removed Door

11/2/2013

 
C - INTERIORS
Wall Infill At a Removed Door and Frame often occurs as part of a remodeling project. The older the existing construction the less likely that the wall thickness matches modern construction. In order to avoid lumps or depressions in the finished wall, a detail like this is needed to match the thickness of the existing. The key to the detail is the split studs which the contractor will have to construct from ripped studs. Where the existing wall is thicker than normal, two rows of staggered studs can make up the thickness. Although this detail is labor intensive, there rarely are very many places where it will be needed. This concept applies to wood stud construction too.

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Schedules - Painting, Sealant, Accessory Schedules

11/1/2013

 
C-INTERIORS
Schedules on the drawings can have many advantages. The information is always available to the contractors. Specifications are simpler since the variable information is on the drawings. You can create a master schedule , insert it into the drawings and edit it when you are ready to make the decisions.
The Painting Schedule and the Sealant Schedule can cover the entire topic by specifying both what to use and where to use it.
The schedules below are samples of edited schedules that we have used.

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