Bullseye window - Revision history

Editor at 17:27, 2 September 2021

2021-09-02T17:27:40Z

← Older revision		Revision as of 17:27, 2 September 2021
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	* Dormer window.		* Dormer window.
	* Easily accessible window.		* Easily accessible window.
		+	* Extrados.
	* Glazing.		* Glazing.
	* Jamb.		* Jamb.

Editor at 17:11, 31 December 2020

2020-12-31T17:11:40Z

← Older revision		Revision as of 17:11, 31 December 2020
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	* Which way up should you lay a brick?		* Which way up should you lay a brick?

−	[[Category:~~Construction_techniques~~]] [[Category:~~Design~~]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Definition]] [[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]

Designing Buildings at 15:42, 30 April 2019

2019-04-30T15:42:19Z

← Older revision		Revision as of 15:42, 30 April 2019
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	\|}		\|}

−	~~‘Bullseye window’ describes~~ a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and can be found in brickwork, concrete, stone, metal cladding and other walling types.	+	A bullseye window is a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and can be found in brickwork, concrete, stone, metal cladding and other walling types.

−	Achieving a perfect circle can be difficult, the degree of which will depend on the material. In in-situ- poured concrete, the shape will be determined by the accuracy of the formwork. In profiled metal cladding, the circle will have to be cut ~~and could be tricky if undertaken~~ by hand~~, whereas~~ factory laser-cutting may be easier and more precise.	+	Achieving a perfect circle can be difficult, the degree of which will depend on the material. In in-situ- poured concrete, the shape will be determined by the accuracy of the formwork. In profiled metal cladding, the circle will have to be cut, sometimes by hand (factory laser-cutting may be easier and more precise).

	= Brickwork bullseyes =		= Brickwork bullseyes =
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	{\|		{\|
−	\| [[File:~~Bullseye 1~~.jpg]]	+	\| [[File:Bullseye_1.jpg\|link=File:Bullseye_1.jpg]]
	\|-		\|-
−	\| The photo above shows widely tapered mortar joints at the extrados which can occur when using standard bricks, in this case, stretchers placed 'on end'. On small radii such as these, tapered bricks ~~would~~ have produced a neater effect.	+	\| The photo above shows widely tapered mortar joints at the extrados which can occur when using standard bricks, in this case, stretchers placed 'on end'. On small radii such as these, tapered bricks may have produced a neater effect.
	\|}		\|}

−	Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result ~~is not only~~ unsightly ~~but~~ – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.	+	Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result can be unsightly, and – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.

−	Aesthetically and structurally, it is considered better for all mortar joints around the opening to have a constant 10mm width so no tapering occurs and all the brick sides are parallel. This can be achieved by using ~~‘specials’ –~~ special trapezoidal-shaped bricks where the outer (extrados) edge is wider than the lower (intrados) edge. The downside of this approach is that compared to standard bricks, ‘specials’ can be very expensive.	+	Aesthetically and structurally, it is considered better for all mortar joints around the opening to have a constant 10mm width so no tapering occurs and all the brick sides are parallel. This can be achieved by using special trapezoidal-shaped bricks where the outer (extrados) edge is wider than the lower (intrados) edge. The downside of this approach is that compared to standard bricks, ‘specials’ can be very expensive.

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
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	* Which way up should you lay a brick?		* Which way up should you lay a brick?

−	[[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]	+	[[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 18:06, 25 April 2019

2019-04-25T18:06:34Z

← Older revision		Revision as of 18:06, 25 April 2019
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	{\|		{\|
−	\| [[File:~~Bullseye 2~~.jpg]]	+	\| [[File:Bullseye_2.jpg\|link=File:Bullseye_2.jpg]]
	\|-		\|-
	\| In the bullseye pictured above, standard headers-on-end have been used, resulting in wide joints at the extrados. Using a special tapered brick would have produced parallel mortar joints.		\| In the bullseye pictured above, standard headers-on-end have been used, resulting in wide joints at the extrados. Using a special tapered brick would have produced parallel mortar joints.
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	= Limitations of the standard brick =		= Limitations of the standard brick =
		+
		+	{\|
		+	\| [[File:Bullseye 1.jpg]]
		+	\|-
		+	\| The photo above shows widely tapered mortar joints at the extrados which can occur when using standard bricks, in this case, stretchers placed 'on end'. On small radii such as these, tapered bricks would have produced a neater effect.
		+	\|}

	Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result is not only unsightly but – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.		Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result is not only unsightly but – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.

Editor at 18:02, 25 April 2019

2019-04-25T18:02:32Z

← Older revision		Revision as of 18:02, 25 April 2019
Line 1:		Line 1:
		+	{\|
		+	\| [[File:Bullseye 2.jpg]]
		+	\|-
		+	\| In the bullseye pictured above, standard headers-on-end have been used, resulting in wide joints at the extrados. Using a special tapered brick would have produced parallel mortar joints.
		+	\|}
		+
	‘Bullseye window’ describes a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and can be found in brickwork, concrete, stone, metal cladding and other walling types.		‘Bullseye window’ describes a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and can be found in brickwork, concrete, stone, metal cladding and other walling types.

Line 9:		Line 15:
	In cavity walls where the brick thickness is 102.5mm, a circular opening can be created by a single- brick circular course; in solid brick walls, particularly when thicker than 215mm, more courses may be used.		In cavity walls where the brick thickness is 102.5mm, a circular opening can be created by a single- brick circular course; in solid brick walls, particularly when thicker than 215mm, more courses may be used.

−	Limitations of the brick	+	= Limitations of the standard brick =

	Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result is not only unsightly but – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.		Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result is not only unsightly but – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.

Editor: Created page with "‘Bullseye window’ describes a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and ca..."

2019-04-25T17:43:04Z

Created page with "‘Bullseye window’ describes a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and ca..."

New page

‘Bullseye window’ describes a circular opening in a wall (of any material) that features a window. It may be referred to as a ‘bullseye’ (or ‘bullseyes’ (pl.)) and can be found in brickwork, concrete, stone, metal cladding and other walling types.

Achieving a perfect circle can be difficult, the degree of which will depend on the material. In in-situ- poured concrete, the shape will be determined by the accuracy of the formwork. In profiled metal cladding, the circle will have to be cut and could be tricky if undertaken by hand, whereas factory laser-cutting may be easier and more precise.

= Brickwork bullseyes =

In brickwork, a bullseye opening can be created by using ‘brick on end’ where the bricks – whether the stretcher or header faces – are laid upright around the opening. Using the stretcher face laid horizontally would normally result in a very unsatisfactory opening aesthetically unless the radii concerned are very large, such as was the case at Louis Kahn’s parliament buildings in Dacca. This is because the short headers (on edge normally) are more able to adapt to the required curvature than the longer stretcher faces which consequently are rarely used for this purpose.

In cavity walls where the brick thickness is 102.5mm, a circular opening can be created by a single- brick circular course; in solid brick walls, particularly when thicker than 215mm, more courses may be used.

Limitations of the brick

Standard bricks may be used for circular openings but if the opening radius is small, the phenomenon of ‘tapering’ of the mortar joints around the circumference occurs. This is where the mortar joint at the top of the brick (extrados) is appreciably wider than that at the inside edge of the opening (intrados). The result is not only unsightly but – if the taper is wide enough at the top end – could result in some bricks at the top of the arch becoming loose.

Aesthetically and structurally, it is considered better for all mortar joints around the opening to have a constant 10mm width so no tapering occurs and all the brick sides are parallel. This can be achieved by using ‘specials’ – special trapezoidal-shaped bricks where the outer (extrados) edge is wider than the lower (intrados) edge. The downside of this approach is that compared to standard bricks, ‘specials’ can be very expensive.

= Related articles on Designing Buildings Wiki =

* Cavity wall.
* Clerestory.
* Crittall metal windows.
* Curved glass.
* Display window.
* Domestic windows.
* Dormer window.
* Easily accessible window.
* Glazing.
* Jamb.
* Mortar.
* Mullion.
* Types of bricks.
* Types of window.
* What are walls made of?
* Which way up should you lay a brick?

[[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]