Tropical

is an approach
focused on building structures that respond
directly to warm, humid climates. Rather than
relying solely on mechanical systems like air
conditioning, it uses passive design strategies
—such as natural ventilation, solar shading,
and material selection—to maintain indoor
thermal comfort, handle heavy rainfall, and
integrate seamlessly with the natural
environment.

NFH

The No Footprint House (NFH), located in

The No Footprint House (NFH), located in Ojochal, a small village at the edge of the vast
______________________ along the South Pacific coast of Costa Rica. Placed in a humid tropical
climate, the building design responds to its surrounding habitat by passive climate control
through natural ventilation and solar shading

The design includes perforated concrete block walls that
create a screen that protects from the outside, but lets
the air flow freely through the space.

A common type of dwelling in lowland and
coastal areas during the Pre-Hispanic
Philippines

A single-slope extension of a gable or hip type roof.

An elevated counter made of bamboo strips usually projecting beyond the kitchen wall which is used to store food and kitchen utensils.

A waist-level railing, made using bamboo, used as an enclosed and protected porch area.

The main access to the house with the entire framework made from bamboo or combined with wood.

The skeletal structural element of a roof or wall, assembled or fitted together to handle the exterior elements or finishes.

A small space adjacent to the cooking area with a service door leading outside. It is used for washing hands and feet, bathing kids and washing pots and dishes.

An elevated earthen fireplace with a stone stove for cooking and layers of open shelves for drying firewood and smoking fish.

The main section of the house used as living, dining, and sleeping areas.

An enclosed/open space under the house where harvests are stored, tools and implement are kept, and livestock (chicken, pigs, goats) are tended.

Cross Ventilation - Positioning openings (windows, doors, and vents) on
opposite sides of a space to capture breeze
b. Stack Effect - High ceilings and clerestory windows allow warm air to
rise and escape, drawing cooler air in from lower levels

Positioning openings (windows, doors, and vents) on
opposite sides of a space to capture breeze

High ceilings and clerestory windows allow warm air to
rise and escape, drawing cooler air in from lower levels.

Deep Overhangs & Eaves: Large roof extensions block harsh overhead
sunlight from directly striking walls and glass.
b. Screening & Louvers: Adjustable slats or brise-soleil (sun baffles) let air
flow through while diffusing intense daylight

Large roof extensions block harsh overhead
sunlight from directly striking walls and glass

Adjustable slats or brise-soleil (sun baffles) let air
flow through while diffusing intense daylight.

Steeply Pitched Roofs: Quick water runoff prevents pooling during
heavy downpours or monsoon rains.
b. Elevated Platforms: Raising floors on stilts or piers protects against
flooding, keeps humidity off floor slabs, and enhances airflow
underneath.

Quick water runoff prevents pooling during
heavy downpours or monsoon rains.

Raising floors on stilts or piers protects against
flooding, keeps humidity off floor slabs, and enhances airflow
underneath.

. Indoor and outdoor gardens
b. Locally Sourced, Low-Thermal-Mass Materials: Utilizing bamboo, timber,
stone, or permeable masonry that doesn't trap and radiate heat
overnight.

Biophilic Integration & Materials

Utilizing bamboo, timber,
stone, or permeable masonry that doesn't trap and radiate heat
overnight.

relies on natural thermodynamic principles—
pressure differences, air density shifts, and thermal transfer—to control indoor
temperatures without consuming mechanical energy.

the main objective isn't just lowering air
temperature; it's maximizing air movement across human skin to increase
sweat evaporation and expand thermal comfort.

Wind creates zones of
positive pressure on the
windward side of a
building and negative
pressure (suction) on the
leeward side.
Air flows naturally from
the high-pressure side
through the interior
toward the low-pressure
side

negative
pressure on leeward side

flows naturally from
the high-pressure side
through the interior
toward the low-pressure
side.

The outlet opening on the leeward side should be equal to or
slightly larger than the windward inlet. This creates a suction effect that increases
velocity inside.

Directing openings perpendicular (90°) or at a slight diagonal
(45°) to prevailing seasonal breezes yields the highest indoor air speeds.

Single-loaded corridors (rooms lined up along one side of an open
hallway) maximize cross-breezes, whereas deep, double-loaded floor plans block air
paths.

direct or flow upward resulting in loss of cooling effect

direct airflow at occupants

should be large or longer than inlets for maximum airflow

As air absorbs heat inside a building—from
occupants, appliances, and solar radiation
through walls—it becomes less dense and rises.
Warm air accumulates under the ceiling and exits
through high outlets (such as clerestories, ridge
vents, or wind scoops). This air release creates
negative pressure at lower levels, drawing cooler
outside air through ground-level windows.

accumulates under the ceiling and exits
through high outlets (such as clerestories, ridge
vents, or wind scoops). This air release creates
negative pressure at lower levels, drawing cooler
outside air through ground-level windows.

strikes buildings at steep
angles from directly overhead, while low-angle sun hits the east and west
facades during mornings and afternoons.

act as the building's first line of defense. By blocking
radiation before it reaches the building envelope, solar control prevents indoor
heat gain, eliminates harsh daylight glare, and protects structural materials
from weather wear.

Extending eaves 1.20 to 1.50 meters or
more beyond exterior walls serves two
main functions:
High-Angle Sun Protection: Blocks
midday overhead sun from hitting the
upper facade and glass openings.
Rain Shielding: Keeps torrential tropical
downpours off window glass, allowing
windows to remain open for natural
cross-ventilation even during rainstorms.

Extending eaves 1.20 to 1.50 meters or
more beyond exterior walls serves two
main functions:

Blocks
midday overhead sun from hitting the
upper facade and glass openings

Keeps torrential tropical
downpours off window glass, allowing
windows to remain open for natural
cross-ventilation even during rainstorms.

Horizontal louvers work best on North and
South facades to block high-angle midday sun.
Vertical fins or louvers are essential on East
and West facades to filter low-angle morning
and late afternoon sun rays.
Perforated / Permeable Screens: Decorative
masonry blocks (breeze blocks or jali screens)
or timber slats diffuse direct sunlight while
permitting breeze penetration.

work best on North and
South facades to block high-angle midday sun.

are essential on East
and West facades to filter low-angle morning
and late afternoon sun rays.

Decorative
masonry blocks (breeze blocks or jali screens)
or timber slats diffuse direct sunlight while
permitting breeze penetration.

Creating secondary exterior enclosures or deep
verandas shields primary living spaces:
Intermediate Spaces: Covered outdoor corridors,
balconies, and porches create a temperature buffer
zone between hot outside air and interior rooms.
Double Envelope: A secondary outer skin takes the
brunt of direct solar radiation, allowing rising air
currents in the cavity to carry away heat before it
reaches the structural wall.

Creating secondary exterior enclosures or deep
verandas shields primary living spaces:

Covered outdoor corridors,
balconies, and porches create a temperature buffer
zone between hot outside air and interior rooms

A secondary outer skin takes the
brunt of direct solar radiation, allowing rising air
currents in the cavity to carry away heat before it
reaches the structural wall.

present a dual challenge when it comes to moisture:
torrential downpours that cause immediate runoff issues, and sustained
high relative humidity (often exceeding 80%) that accelerates mold, wood
rot, and structural decay

in tropical architecture isn't just about
waterproofing—it's about directing water away from the building as
quickly as possible while allowing building assemblies to dry out rapidly
through continuous air movement.

The roof is a tropical structure's primary shield against rain. Standard
flat roofs frequently fail in wet tropical zones due to ponding water and
clogged drains.
Steep Roof Pitches (30° to 45°+): High slope angles use gravity to shed
sudden, high-volume rainfall instantly before water can back up under
roof tiles or seams.
Ridge Vents & Double Roofs: Allowing air to circulate directly beneath
the roofing material carries away evaporated moisture that would
otherwise condense on the underside of roof sheets.

s a tropical structure's primary shield against rain. Standard
flat roofs frequently fail in wet tropical zones due to ponding water and
clogged drains.

High slope angles use gravity to shed
sudden, high-volume rainfall instantly before water can back up under
roof tiles or seams.

Allowing air to circulate directly beneath
the roofing material carries away evaporated moisture that would
otherwise condense on the underside of roof sheets.

In tropical regions, the ground stays saturated for months during monsoon
seasons, transferring dampness into floors and inviting termites

Raising the main floor slab 0.5 to 2+
meters above grade protects living spaces from flash floods and surface
runoff.

Air passing beneath an elevated floor cools the
underside of the slab/deck and dries out ground moisture before it can
migrate into interior finishes.

Impervious damp-proof courses (DPC) between
concrete footings and timber or masonry walls block groundwater
from wicking upward into structural elements.

Extending protection to exterior walls, windows, and doors keeps moisture
out while allowing natural ventilation during storms

Projecting eaves push the drip line far beyond
the foundation, ensuring rain falls well clear of wall bases.

Grooves cut into the undersides of overhangs,
window sills, and balcony edges break the capillary action of water,
preventing rain from flowing backward along ceilings or walls.

Permeable jalousies or angled louvers allow
fresh air to enter while defecting wind-driven rain downward

form the emotional and
sensory backbone of tropical architecture. Biophilic design connects
inhabitants to nature, while intelligent material choices respond directly to
the heat, humidity, and decay factors of tropical environments

connects
inhabitants to nature, while intelligent material choices respond directly to
the heat, humidity, and decay factors of tropical environments.

Biophilic design incorporates natural elements into built environments to lower
stress, improve indoor air quality, and foster psychological well-being.
Blurring Indoor-Outdoor Boundaries: Large open verandahs, retractable
glass walls, and threshold-free floors create a continuous flow from interior
spaces out to surrounding gardens and courtyards.
Internal Courtyards & Light Wells: Open-air central courtyards draw daylight
deep into interior rooms while serving as microclimatic cooling hubs that
channel breezes and hold lush tropical flora.
Vertical Greening & Sky Gardens: Green walls, vegetated trellises, and
overhanging planter boxes block solar radiation from concrete surfaces,
lower ambient temperatures through evapotranspiration, and filter dust.
Water Features as Cooling Anchors: Reflecting pools, koi ponds, and
fountains placed near windward openings pre-cool incoming air via
evaporative cooling while introducing soothing auditory soundscapes

Large open verandahs, retractable
glass walls, and threshold-free floors create a continuous flow from interior
spaces out to surrounding gardens and courtyards.

Open-air central courtyards draw daylight
deep into interior rooms while serving as microclimatic cooling hubs that
channel breezes and hold lush tropical flora.

Green walls, vegetated trellises, and
overhanging planter boxes block solar radiation from concrete surfaces,
lower ambient temperatures through evapotranspiration, and filter dust

Reflecting pools, koi ponds, and
fountains placed near windward openings pre-cool incoming air via
evaporative cooling while introducing soothing auditory soundscapes.

Selecting materials in tropical climates requires balancing thermal performance
(how heat travels through the material) with durability against high humidity, salt
spray, mold, and insect activity

Materials like timber, bamboo,
rattan, and light steel screens do not store heat during the day, so they cool down
almost immediately when the sun sets.

Concrete, rammed earth, and stone
absorb heat during hot daylight hours. In tropical design, high-mass materials are
used selectively in shaded zones or cooled floor slabs to act as thermal heat sinks
without radiating warmth into sleeping areas at night.

structural
posts/columns, beams,
brise-soleil, ceiling,
walls, floors, windows
exceptionally high tensile
strength, highly renewable, low
embodied carbon, and excellent
elasticity in windstorms.

structural
posts/columns, beams,
brise-soleil, ceiling,
walls, floors, windows
High natural oil content resists
moisture penetration, fungal
decay, warping, and termite
attacks.

Facade, screen walls
Provides sun shading and
privacy while allowing
breeze penetration and
natural light diffusion.

Roofing insulation layer,
ceiling linings.
Superior natural thermal
insulation; keeps roof spaces
significantly cooler than metal
sheets