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The core principles of PLEM™ are as follows:

 

1. Monolithic Reinforced Concrete Shell

The first essential characteristic is that every structure must be enclosed within a monolithic reinforced concrete shell. This shell can be constructed using traditional methods or innovative technologies, such as 3D printing, as long as the outcome meets the required standards (e.g., Fox Blocks, SIPs Kit Homes, or 3D concrete pouring).​ The reinforced low-footprint concrete shell will align with the chosen layout, floor plan, and design of the structure it encloses, providing flexibility in architectural planning.

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2. Non-Flammable Materials Beyond the Shell

No wood or other combustible materials are permitted beyond the reinforced concrete shell. All exterior elements, such as window frames, doors, and garage doors, must be made of fire-resistant materials, such as metal or other non-flammable alternatives.

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3. Optimal Window Orientation for Sunlight
The placement and orientation of windows should align with seasonal sun patterns to optimize energy efficiency and indoor comfort. As per Griffith Observatory, “The tilt of Earth’s axis determines where the sun appears in the sky throughout the year. During summer in the northern hemisphere, the sun rises north of east and sets north of west.

It is high in the sky at noon. During winter in the northern hemisphere, sunrise and sunset appear farther south along the horizon.” :

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• South-Facing Windows: Installing large windows on the south side to let in sunlight during winter for warmth while keeping the interior cool in summer.

• East & West-Facing Windows: Using these windows sparingly. Plant deciduous trees nearby to provide shade in summer and allow sunlight in winter.

• North-Facing Windows: Avoid them when possible, as they lack winter sunlight, making the home colder in winter and warmer in summer, both of which are uncomfortable.